.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/paystack.iml" filepath="$PROJECT_DIR$/.idea/paystack.iml" />
+    </modules>
+  </component>
+</project>

.idea/paystack.iml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/php.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MessDetectorOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCSFixerOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCodeSnifferOptionsConfiguration">
+    <option name="highlightLevel" value="WARNING" />
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PhpStanOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PsalmOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

LICENSE

@@ -1,73 +0,0 @@
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-Version 2.0, January 2004
-http://www.apache.org/licenses/
-
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README.md

@@ -1,2 +0,0 @@
-# paystack
-

config/autoload.php

@@ -0,0 +1,4 @@
+<?php
+defined('BASEPATH') or exit('No direct script access allowed');
+
+$autoload['model'] = array('paystack_model');

controllers/Admin.php

@@ -0,0 +1,240 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Admin extends AdminController
+{
+    public function __construct()
+    {
+        parent::__construct();
+        $this->load->model('paystack_model');
+    }
+
+    /**
+     * Display settings page
+     */
+    public function settings()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            access_denied('settings');
+        }
+
+        if ($this->input->post()) {
+            if (!has_permission('settings', '', 'edit')) {
+                access_denied('settings');
+            }
+
+            $data = $this->input->post();
+            $success = $this->paystack_model->update_settings($data);
+
+            if ($success) {
+                set_alert('success', _l('settings_updated'));
+            }
+        }
+
+        $data['title'] = _l('paystack_settings');
+        $data['tab'] = 'settings';
+        $this->load->view('admin/settings', $data);
+    }
+
+    /**
+     * Display transaction logs
+     */
+    public function transactions()
+    {
+        if (!has_permission('payments', '', 'view')) {
+            access_denied('payments');
+        }
+
+        $data['title'] = _l('paystack_transactions');
+        $data['tab'] = 'transactions';
+
+        // Get filters
+        $filter = [
+            'start_date' => $this->input->get('start_date'),
+            'end_date' => $this->input->get('end_date'),
+            'status' => $this->input->get('status')
+        ];
+
+        $data['transactions'] = $this->paystack_model->get_transactions($filter);
+        $this->load->view('admin/transactions', $data);
+    }
+
+    /**
+     * Display test mode interface
+     */
+    public function test_mode()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            access_denied('settings');
+        }
+
+        $data['title'] = _l('paystack_test_mode');
+        $data['tab'] = 'test_mode';
+        $data['test_keys'] = $this->paystack_model->get_test_keys();
+        $this->load->view('admin/test_mode', $data);
+    }
+
+    /**
+     * Display payment status dashboard
+     */
+    public function dashboard()
+    {
+        if (!has_permission('payments', '', 'view')) {
+            access_denied('payments');
+        }
+
+        $data['title'] = _l('paystack_dashboard');
+        $data['tab'] = 'dashboard';
+
+        // Get statistics
+        $data['stats'] = $this->paystack_model->get_payment_stats();
+        $data['recent_transactions'] = $this->paystack_model->get_recent_transactions();
+        $data['monthly_chart'] = $this->paystack_model->get_monthly_chart_data();
+
+        $this->load->view('admin/dashboard', $data);
+    }
+
+    /**
+     * Get transaction details (AJAX)
+     */
+    public function get_transaction_details($reference)
+    {
+        if (!has_permission('payments', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $transaction = $this->paystack_model->get_transaction($reference);
+        echo json_encode($transaction);
+    }
+
+    /**
+     * Verify test webhook
+     */
+//    public function test_webhook()
+//    {
+//        if (!has_permission('settings', '', 'view')) {
+//            ajax_access_denied();
+//        }
+//
+//        $this->load->library('paystack_gateway');
+//        $result = $this->paystack_gateway->test_webhook();
+//
+//        echo json_encode($result);
+//    }
+
+    /**
+     * Initiate test payment
+     */
+    public function initiate_test_payment()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $amount = $this->input->post('amount');
+        $email = $this->input->post('email');
+
+        if (!$amount || !$email) {
+            echo json_encode([
+                'success' => false,
+                'message' => _l('invalid_input')
+            ]);
+            return;
+        }
+
+        $reference = 'TEST_' . time() . '_' . mt_rand(1000, 9999);
+
+        echo json_encode([
+            'success' => true,
+            'reference' => $reference
+        ]);
+    }
+
+    /**
+     * Test webhook connection
+     */
+    public function test_webhook()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $this->load->library('paystack_gateway');
+
+        // Try to send a test webhook
+        $webhook_url = site_url('paystack/webhook');
+        $test_data = [
+            'event' => 'test',
+            'data' => [
+                'reference' => 'TEST_' . time(),
+                'status' => 'success'
+            ]
+        ];
+
+        $ch = curl_init($webhook_url);
+        curl_setopt($ch, CURLOPT_POST, 1);
+        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($test_data));
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_HTTPHEADER, [
+            'Content-Type: application/json',
+            'X-Paystack-Signature: ' . hash_hmac('sha512', json_encode($test_data), $this->paystack_gateway->get_webhook_secret())
+        ]);
+
+        $response = curl_exec($ch);
+        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        curl_close($ch);
+
+        if ($http_code == 200) {
+            echo json_encode([
+                'success' => true,
+                'message' => _l('webhook_received_response')
+            ]);
+        } else {
+            echo json_encode([
+                'success' => false,
+                'message' => _l('webhook_connection_failed') . ' (HTTP ' . $http_code . ')'
+            ]);
+        }
+    }
+
+    /**
+     * Log debug message
+     */
+    public function log_debug()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $message = $this->input->post('message');
+        if ($message) {
+            $this->paystack_model->add_debug_log($message);
+        }
+    }
+
+    /**
+     * Get debug log
+     */
+    public function get_debug_log()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $log = $this->paystack_model->get_debug_log();
+        echo $log;
+    }
+
+    /**
+     * Clear debug log
+     */
+    public function clear_debug_log()
+    {
+        if (!has_permission('settings', '', 'view')) {
+            ajax_access_denied();
+        }
+
+        $this->paystack_model->clear_debug_log();
+    }
+}

controllers/Paystack.php

@@ -0,0 +1,337 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Paystack extends App_Controller
+{
+    public function __construct()
+    {
+        parent::__construct();
+        $this->load->model('invoices_model');
+        $this->load->model('clients_model');
+        $this->load->library('paystack_gateway');
+        $this->load->model('paystack/paystack_model');
+    }
+
+    /**
+     * Show payment form
+     */
+    public function make_payment()
+    {
+        $payment_data = $this->session->userdata('paystack_payment_data');
+
+        if (!$payment_data) {
+            set_alert('danger', _l('invalid_payment'));
+            redirect(site_url('invoices'));
+        }
+
+        $invoice = $this->invoices_model->get($payment_data['invoice_id']);
+        if (!$invoice) {
+            set_alert('danger', _l('invoice_not_found'));
+            redirect(site_url('invoices'));
+        }
+
+        // Get client data
+        $client = $this->clients_model->get($invoice->clientid);
+
+        $data = [];
+        $data['invoice'] = $invoice;
+        $data['payment_data'] = $payment_data;
+        $data['client'] = $client;
+
+        $this->load->view('paystack/payment', $data);
+    }
+
+    /**
+     * Verify payment callback
+     */
+    public function verify_payment($reference = null)
+    {
+        if (!$reference) {
+            redirect(site_url('clients/invoices'));
+        }
+
+        // Log verification attempt
+        $this->paystack_model->add_payment_log([
+            'message' => 'Verifying payment: ' . $reference,
+            'log_type' => 'info'
+        ]);
+
+        $transaction = $this->paystack_gateway->verify_transaction($reference);
+
+        if ($transaction['success']) {
+            // Get the transaction from our database
+            $local_transaction = $this->paystack_model->get_transaction_by_reference($reference);
+
+            if ($local_transaction) {
+                // Update local transaction status
+                $this->db->where('id', $local_transaction['id']);
+                $this->db->update(db_prefix() . 'paystack_transactions', [
+                    'status' => 'success',
+                    'transaction_date' => date('Y-m-d H:i:s')
+                ]);
+
+                // Record the payment in Perfex CRM
+                $payment_data = [
+                    'amount' => $local_transaction['amount'],
+                    'invoiceid' => $local_transaction['invoice_id'],
+                    'paymentmode' => 'paystack',
+                    'transactionid' => $reference
+                ];
+
+                $this->load->model('payments_model');
+                $payment_id = $this->payments_model->add($payment_data);
+
+                if ($payment_id) {
+                    set_alert('success', _l('payment_recorded_successfully'));
+                } else {
+                    set_alert('danger', _l('payment_record_failed'));
+                }
+            }
+        } else {
+            set_alert('danger', _l('payment_failed'));
+        }
+
+        // Redirect to invoice
+        redirect(site_url('clients/invoices'));
+    }
+
+    /**
+     * Handle Paystack webhook
+     */
+//    public function webhook()
+//    {
+//        if ((strtoupper($_SERVER['REQUEST_METHOD']) != 'POST') || !array_key_exists('HTTP_X_PAYSTACK_SIGNATURE', $_SERVER)) {
+//            exit();
+//        }
+//
+//        $input = file_get_contents("php://input");
+//
+//        // Verify webhook signature
+//        $secret_key = $this->paystack_gateway->decryptSetting('paystack_secret_key');
+//        if ($_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] !== hash_hmac('sha512', $input, $secret_key)) {
+//            exit();
+//        }
+//
+//        http_response_code(200);
+//
+//        $event = json_decode($input);
+//
+//        // Handle the event
+//        switch ($event->event) {
+//            case 'charge.success':
+//                $this->handle_successful_charge($event->data);
+//                break;
+//            case 'transfer.success':
+//                $this->handle_successful_transfer($event->data);
+//                break;
+//            case 'charge.failed':
+//                $this->handle_failed_charge($event->data);
+//                break;
+//        }
+//
+//        exit();
+//    }
+    public function webhook()
+    {
+        $this->load->helper('paystack_security');
+
+        // Get payload and signature
+        $payload = file_get_contents('php://input');
+        $signature = isset($_SERVER['HTTP_X_PAYSTACK_SIGNATURE']) ? $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] : '';
+
+        // Log webhook request
+        $this->paystack_model->add_webhook_log([
+            'event' => 'webhook_received',
+            'payload' => $payload,
+            'signature' => $signature,
+            'status' => 'received'
+        ]);
+
+        // Verify signature
+        if (!verify_paystack_webhook_signature($payload, $signature)) {
+            $this->paystack_model->add_webhook_log([
+                'event' => 'webhook_verification_failed',
+                'payload' => $payload,
+                'status' => 'failed',
+                'message' => 'Invalid signature'
+            ]);
+            header('HTTP/1.1 401 Unauthorized');
+            exit();
+        }
+
+        // Parse payload
+        $event = json_decode($payload);
+
+        // Validate payload
+        if (!is_object($event) || !isset($event->event)) {
+            $this->paystack_model->add_webhook_log([
+                'event' => 'webhook_invalid_payload',
+                'payload' => $payload,
+                'status' => 'failed',
+                'message' => 'Invalid payload format'
+            ]);
+            header('HTTP/1.1 400 Bad Request');
+            exit();
+        }
+
+        try {
+            // Process different event types
+            switch ($event->event) {
+                case 'charge.success':
+                    $this->handle_successful_charge($event->data);
+                    break;
+
+                case 'charge.failed':
+                    $this->handle_failed_charge($event->data);
+                    break;
+
+                case 'transfer.success':
+                    $this->handle_successful_transfer($event->data);
+                    break;
+
+                case 'transfer.failed':
+                    $this->handle_failed_transfer($event->data);
+                    break;
+
+                default:
+                    // Log unknown event type
+                    $this->paystack_model->add_webhook_log([
+                        'event' => $event->event,
+                        'payload' => $payload,
+                        'status' => 'skipped',
+                        'message' => 'Unknown event type'
+                    ]);
+                    break;
+            }
+
+            header('HTTP/1.1 200 OK');
+            echo json_encode(['status' => 'success']);
+        } catch (Exception $e) {
+            // Log error
+            $this->paystack_model->add_webhook_log([
+                'event' => $event->event,
+                'payload' => $payload,
+                'status' => 'error',
+                'message' => $e->getMessage()
+            ]);
+
+            header('HTTP/1.1 500 Internal Server Error');
+            echo json_encode(['status' => 'error', 'message' => 'Internal processing error']);
+        }
+    }
+
+    /**
+     * Handle successful charge
+     */
+    private function handle_successful_charge($data)
+    {
+        // Validate the charge data
+        if (!isset($data->reference) || !isset($data->amount)) {
+            throw new Exception('Invalid charge data');
+        }
+
+        // Find the transaction
+        $transaction = $this->paystack_model->get_transaction_by_reference($data->reference);
+
+        if (!$transaction) {
+            throw new Exception('Transaction not found');
+        }
+
+        // Verify amount
+        $expected_amount = $transaction['amount'] * 100; // Convert to kobo
+        if ($data->amount !== $expected_amount) {
+            throw new Exception('Amount mismatch');
+        }
+
+        // Update transaction status
+        $this->paystack_model->update_transaction($transaction['id'], [
+            'status' => 'success',
+            'transaction_date' => date('Y-m-d H:i:s')
+        ]);
+
+        // Add to payment logs
+        $this->paystack_model->add_payment_log([
+            'transaction_id' => $transaction['id'],
+            'invoice_id' => $transaction['invoice_id'],
+            'amount' => $transaction['amount'],
+            'message' => 'Payment successful',
+            'log_type' => 'success'
+        ]);
+
+        // Record payment in Perfex CRM
+        $payment_data = [
+            'amount' => $transaction['amount'],
+            'invoiceid' => $transaction['invoice_id'],
+            'paymentmode' => 'paystack',
+            'transactionid' => $data->reference
+        ];
+
+        $this->load->model('payments_model');
+        $payment_id = $this->payments_model->add($payment_data);
+
+        if (!$payment_id) {
+            throw new Exception('Failed to record payment');
+        }
+
+        // Send email notification
+        $this->send_payment_notification($transaction['invoice_id'], $payment_id);
+    }
+
+    /**
+     * Handle failed charge
+     */
+    private function handle_failed_charge($data)
+    {
+        if (!isset($data->reference)) {
+            throw new Exception('Invalid charge data');
+        }
+
+        $transaction = $this->paystack_model->get_transaction_by_reference($data->reference);
+
+        if ($transaction) {
+            // Update transaction status
+            $this->paystack_model->update_transaction($transaction['id'], [
+                'status' => 'failed',
+                'transaction_date' => date('Y-m-d H:i:s')
+            ]);
+
+            // Add to payment logs
+            $this->paystack_model->add_payment_log([
+                'transaction_id' => $transaction['id'],
+                'invoice_id' => $transaction['invoice_id'],
+                'amount' => $transaction['amount'],
+                'message' => 'Payment failed: ' . ($data->gateway_response ?? 'Unknown error'),
+                'log_type' => 'error'
+            ]);
+        }
+    }
+
+    /**
+     * Handle successful transfer
+     */
+    private function handle_successful_transfer($data)
+    {
+        log_activity('Paystack Webhook: Successful transfer - Reference: ' . $data->reference);
+    }
+
+    /**
+     * Send payment success email
+     */
+    private function send_payment_success_email($invoice_id, $transaction)
+    {
+        $this->load->model('emails_model');
+
+        $invoice = $this->invoices_model->get($invoice_id);
+        $client = $this->clients_model->get($invoice->clientid);
+
+        $email_template = 'invoice-payment-recorded';
+        $merge_fields = [];
+        $merge_fields = array_merge($merge_fields, get_invoice_merge_fields($invoice_id));
+        $merge_fields = array_merge($merge_fields, get_client_merge_fields($client->userid));
+        $merge_fields['{payment_total}'] = app_format_money($transaction['data']->amount / 100, $invoice->currency_name);
+        $merge_fields['{payment_reference}'] = $transaction['data']->reference;
+
+        $this->emails_model->send_email_template($email_template, $client->email, $merge_fields);
+    }
+}

helpers/paystack_security_helper.php

@@ -0,0 +1,75 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+/**
+ * Verify Paystack webhook signature
+ */
+function verify_paystack_webhook_signature($payload, $signature)
+{
+    $secret_key = get_option('paystack_webhook_secret');
+    $calculated_signature = hash_hmac('sha512', $payload, $secret_key);
+
+    return hash_equals($calculated_signature, $signature);
+}
+
+/**
+ * Validate Paystack API response
+ */
+function validate_paystack_api_response($response)
+{
+    if (!is_object($response)) {
+        return [
+            'valid' => false,
+            'message' => 'Invalid response format'
+        ];
+    }
+
+    if (!isset($response->status) || $response->status !== true) {
+        return [
+            'valid' => false,
+            'message' => isset($response->message) ? $response->message : 'Invalid response status'
+        ];
+    }
+
+    return [
+        'valid' => true,
+        'data' => $response->data
+    ];
+}
+
+/**
+ * Sanitize API keys
+ */
+function sanitize_paystack_keys($key)
+{
+    return preg_replace('/[^a-zA-Z0-9_]/', '', $key);
+}
+
+/**
+ * Validate amount
+ */
+function validate_paystack_amount($amount)
+{
+    return is_numeric($amount) && $amount > 0;
+}
+
+/**
+ * Encrypt sensitive data
+ */
+function encrypt_paystack_data($data)
+{
+    $CI = &get_instance();
+    $CI->load->library('encryption');
+    return $CI->encryption->encrypt($data);
+}
+
+/**
+ * Decrypt sensitive data
+ */
+function decrypt_paystack_data($data)
+{
+    $CI = &get_instance();
+    $CI->load->library('encryption');
+    return $CI->encryption->decrypt($data);
+}

install.php

@@ -0,0 +1,71 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+// Paystack transactions table
+if (!$CI->db->table_exists(db_prefix() . 'paystack_transactions')) {
+    $CI->db->query('CREATE TABLE `' . db_prefix() . 'paystack_transactions` (
+        `id` int(11) NOT NULL AUTO_INCREMENT,
+        `invoice_id` int(11) NOT NULL,
+        `reference` varchar(100) NOT NULL,
+        `email` varchar(100) NOT NULL,
+        `amount` decimal(15,2) NOT NULL,
+        `status` varchar(20) DEFAULT NULL,
+        `transaction_date` datetime NOT NULL,
+        `date_created` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        PRIMARY KEY (`id`),
+        KEY `invoice_id` (`invoice_id`),
+        KEY `reference` (`reference`),
+        KEY `status` (`status`)
+    ) ENGINE=InnoDB DEFAULT CHARSET=' . $CI->db->char_set . ';');
+}
+
+// Paystack payment logs table
+if (!$CI->db->table_exists(db_prefix() . 'paystack_payment_logs')) {
+    $CI->db->query('CREATE TABLE `' . db_prefix() . 'paystack_payment_logs` (
+        `id` int(11) NOT NULL AUTO_INCREMENT,
+        `transaction_id` int(11) DEFAULT NULL,
+        `invoice_id` int(11) DEFAULT NULL,
+        `amount` decimal(15,2) DEFAULT NULL,
+        `message` text,
+        `log_type` varchar(50) DEFAULT NULL,
+        `ip_address` varchar(45) DEFAULT NULL,
+        `user_agent` text,
+        `date_created` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        PRIMARY KEY (`id`),
+        KEY `transaction_id` (`transaction_id`),
+        KEY `invoice_id` (`invoice_id`),
+        KEY `log_type` (`log_type`)
+    ) ENGINE=InnoDB DEFAULT CHARSET=' . $CI->db->char_set . ';');
+}
+
+// Paystack webhook logs table
+if (!$CI->db->table_exists(db_prefix() . 'paystack_webhook_logs')) {
+    $CI->db->query('CREATE TABLE `' . db_prefix() . 'paystack_webhook_logs` (
+        `id` int(11) NOT NULL AUTO_INCREMENT,
+        `event` varchar(100) NOT NULL,
+        `payload` text,
+        `status` varchar(20) DEFAULT NULL,
+        `ip_address` varchar(45) DEFAULT NULL,
+        `date_created` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        PRIMARY KEY (`id`),
+        KEY `event` (`event`),
+        KEY `status` (`status`)
+    ) ENGINE=InnoDB DEFAULT CHARSET=' . $CI->db->char_set . ';');
+}
+
+// Add payment gateway options if they don't exist
+$options = [
+    ['name' => 'paystack_test_mode', 'value' => '1'],
+    ['name' => 'paystack_live_secret_key', 'value' => ''],
+    ['name' => 'paystack_live_public_key', 'value' => ''],
+    ['name' => 'paystack_test_secret_key', 'value' => ''],
+    ['name' => 'paystack_test_public_key', 'value' => ''],
+    ['name' => 'paystack_webhook_secret', 'value' => '']
+];
+
+foreach ($options as $option) {
+    if (!get_option($option['name'])) {
+        add_option($option['name'], $option['value']);
+    }
+}

language/english/paystack_lang.php

@@ -0,0 +1,127 @@
+<?php
+
+# Gateway Name
+$lang['paystack']                           = 'Paystack';
+$lang['paystack_gateway_name']              = 'Paystack Payment Gateway';
+
+# Settings
+$lang['settings_paystack_secret_key']       = 'Secret Key';
+$lang['settings_paystack_public_key']       = 'Public Key';
+$lang['settings_paystack_test_mode_enabled'] = 'Test Mode';
+$lang['settings_group_paystack']            = 'Paystack Settings';
+
+# Messages
+$lang['payment_received']                   = 'Payment received successfully';
+$lang['payment_failed']                     = 'Payment failed';
+$lang['payment_cancelled']                  = 'Payment cancelled';
+
+# Errors
+$lang['paystack_invalid_transaction']       = 'Invalid transaction';
+$lang['paystack_transaction_not_found']     = 'Transaction not found';
+$lang['paystack_invalid_reference']         = 'Invalid reference';
+$lang['paystack_api_error']                = 'API Error: %s';
+
+
+# Gateway Settings
+$lang['paystack']                               = 'Paystack';
+$lang['paystack_gateway_name']                  = 'Paystack Payment Gateway';
+$lang['paystack_live_secret_key']              = 'Live Secret Key';
+$lang['paystack_live_public_key']              = 'Live Public Key';
+$lang['paystack_test_secret_key']              = 'Test Secret Key';
+$lang['paystack_test_public_key']              = 'Test Public Key';
+$lang['test_mode_enabled']                     = 'Test Mode Enabled';
+$lang['webhook_secret']                        = 'Webhook Secret';
+$lang['max_retry_attempts']                    = 'Maximum Retry Attempts';
+
+# Payment Status
+$lang['payment_successful']                     = 'Payment Successful';
+$lang['payment_failed']                         = 'Payment Failed';
+$lang['payment_pending']                        = 'Payment Pending';
+$lang['payment_cancelled']                      = 'Payment Cancelled';
+$lang['payment_processing']                     = 'Processing Payment';
+$lang['payment_validation_failed']              = 'Payment Validation Failed';
+
+# Error Messages
+$lang['invalid_transaction']                    = 'Invalid Transaction';
+$lang['invalid_amount']                         = 'Invalid Amount';
+$lang['invalid_currency']                       = 'Invalid Currency';
+$lang['invalid_email']                          = 'Invalid Email';
+$lang['invalid_reference']                      = 'Invalid Reference';
+$lang['transaction_failed']                     = 'Transaction Failed';
+$lang['transaction_expired']                    = 'Transaction Expired';
+$lang['rate_limit_exceeded']                    = 'Too many attempts. Please try again later.';
+$lang['api_error']                             = 'API Error: %s';
+$lang['verification_failed']                    = 'Transaction Verification Failed';
+$lang['webhook_verification_failed']            = 'Webhook Verification Failed';
+
+# Success Messages
+$lang['payment_recorded']                       = 'Payment Recorded Successfully';
+$lang['webhook_received']                       = 'Webhook Received Successfully';
+$lang['verification_successful']                = 'Verification Successful';
+
+# Transaction Details
+$lang['transaction_reference']                  = 'Transaction Reference';
+$lang['total_transactions']                  = 'Total Transaction';
+$lang['transaction_amount']                     = 'Amount';
+$lang['transaction_date']                       = 'Transaction Date';
+$lang['transaction_status']                     = 'Status';
+$lang['transaction_currency']                   = 'Currency';
+$lang['transaction_email']                      = 'Email';
+$lang['recent_transactions']                    = 'Recent transactions';
+$lang['monthly_transactions']                   = 'Monthly transactions';
+$lang['successful_transactions']                   = 'Successful Transactions';
+$lang['failed_transactions']                   = 'Failed Transactions';
+
+# Admin Area
+$lang['paystack_settings']                      = 'Paystack Settings';
+$lang['test_mode_warning']                      = 'Gateway is in Test Mode. Real payments will not be processed.';
+$lang['settings_updated']                       = 'Settings Updated Successfully';
+$lang['view_transaction']                       = 'View Transaction';
+$lang['retry_payment']                          = 'Retry Payment';
+$lang['gateway_mode']                           = 'Gateway Mode';
+$lang['live_mode']                             = 'Live Mode';
+$lang['test_mode']                             = 'Test Mode';
+
+# Logging
+$lang['payment_attempt_logged']                 = 'Payment Attempt Logged';
+$lang['api_request_logged']                     = 'API Request Logged';
+$lang['error_logged']                          = 'Error Logged';
+$lang['view_logs']                             = 'View Logs';
+$lang['clear_logs']                            = 'Clear Logs';
+
+# Webhook
+$lang['webhook_url']                           = 'Webhook URL';
+$lang['webhook_setup_guide']                   = 'Webhook Setup Guide';
+$lang['configure_webhook']                     = 'Configure Webhook';
+$lang['test_webhook']                          = 'Test Webhook';
+
+# Security
+$lang['security_settings']                     = 'Security Settings';
+$lang['encryption_key']                        = 'Encryption Key';
+$lang['rate_limiting']                         = 'Rate Limiting';
+$lang['attempts_allowed']                      = 'Attempts Allowed';
+$lang['timeframe_minutes']                     = 'Timeframe (Minutes)';
+
+# Documentation
+$lang['integration_guide']                     = 'Integration Guide';
+$lang['api_documentation']                     = 'API Documentation';
+$lang['troubleshooting_guide']                = 'Troubleshooting Guide';
+
+# Buttons
+$lang['pay_with_paystack']                     = 'Pay with Paystack';
+$lang['verify_payment']                        = 'Verify Payment';
+$lang['retry_verification']                    = 'Retry Verification';
+$lang['cancel_payment']                        = 'Cancel Payment';
+
+# Misc
+$lang['paystack_not_configured']               = 'Paystack Gateway is not properly configured';
+$lang['contact_support']                       = 'Contact Support';
+$lang['view_transaction_history']              = 'View Transaction History';
+$lang['export_transactions']                   = 'Export Transactions';
+$lang['sync_transactions']                     = 'Sync Transactions';
+$lang['paystack_transactions']                     = 'Paystack Transactions';
+$lang['paystack_dashboard']                     = 'Dashboard';
+$lang['dashboard']                              = 'Dashboard';
+$lang['transactions']                              = 'Transactions';
+$lang['start_date'] =                           'Start Date';
+$lang['end_date'] =                           'End Date';

libraries/Paystack_error_handler.php

@@ -0,0 +1,112 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Paystack_error_handler
+{
+    protected $CI;
+    protected $errors = [];
+
+    public function __construct()
+    {
+        $this->CI = &get_instance();
+    }
+
+    /**
+     * Handle API errors
+     */
+    public function handle_api_error($response, $context = '')
+    {
+        $error_data = [
+            'type' => 'api_error',
+            'context' => $context,
+            'message' => isset($response->message) ? $response->message : 'Unknown API error',
+            'code' => isset($response->code) ? $response->code : null,
+            'timestamp' => date('Y-m-d H:i:s')
+        ];
+
+        $this->log_error($error_data);
+        return $error_data;
+    }
+
+    /**
+     * Handle validation errors
+     */
+    public function handle_validation_error($errors, $context = '')
+    {
+        $error_data = [
+            'type' => 'validation_error',
+            'context' => $context,
+            'message' => is_array($errors) ? implode(', ', $errors) : $errors,
+            'timestamp' => date('Y-m-d H:i:s')
+        ];
+
+        $this->log_error($error_data);
+        return $error_data;
+    }
+
+    /**
+     * Handle system errors
+     */
+    public function handle_system_error($exception, $context = '')
+    {
+        $error_data = [
+            'type' => 'system_error',
+            'context' => $context,
+            'message' => $exception->getMessage(),
+            'file' => $exception->getFile(),
+            'line' => $exception->getLine(),
+            'trace' => $exception->getTraceAsString(),
+            'timestamp' => date('Y-m-d H:i:s')
+        ];
+
+        $this->log_error($error_data);
+        return $error_data;
+    }
+
+    /**
+     * Log error
+     */
+    protected function log_error($error_data)
+    {
+        // Add to errors array
+        $this->errors[] = $error_data;
+
+        // Log to database
+        $this->CI->load->model('paystack_model');
+        $log_data = [
+            'message' => json_encode($error_data),
+            'log_type' => 'error'
+        ];
+        $this->CI->paystack_model->add_payment_log($log_data);
+
+        // Log to system log if serious error
+        if ($error_data['type'] === 'system_error') {
+            log_message('error', 'Paystack Error: ' . $error_data['message']);
+        }
+    }
+
+    /**
+     * Get last error
+     */
+    public function get_last_error()
+    {
+        return end($this->errors);
+    }
+
+    /**
+     * Get all errors
+     */
+    public function get_all_errors()
+    {
+        return $this->errors;
+    }
+
+    /**
+     * Clear errors
+     */
+    public function clear_errors()
+    {
+        $this->errors = [];
+    }
+}

libraries/Paystack_gateway.php

@@ -0,0 +1,378 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Paystack_gateway extends App_gateway
+{
+    protected $test_mode;
+    protected $api_url = 'https://api.paystack.co/';
+
+    public function __construct()
+    {
+        parent::__construct();
+
+        $this->test_mode = get_option('test_mode_enabled');
+
+        // Load the model using the full module path
+        $this->ci->load->model('paystack/paystack_model');
+
+        $this->setId('paystack');
+        $this->setName('Paystack');
+
+        /**
+         * Enhanced settings with additional security options
+         */
+        $this->setSettings([
+            [
+                'name' => 'paystack_secret_key',
+                'encrypted' => true,
+                'label' => 'Paystack Secret Key',
+                'type' => 'input'
+            ],
+            [
+                'name' => 'paystack_public_key',
+                'label' => 'Paystack Public Key',
+                'type' => 'input'
+            ],
+            [
+                'name' => 'test_mode_enabled',
+                'label' => 'Test Mode',
+                'type' => 'yes_no',
+                'default_value' => 1
+            ],
+            [
+                'name' => 'currencies',
+                'label' => 'settings_paymentmethod_currencies',
+                'default_value' => 'NGN,USD,GHS,ZAR'
+            ],
+            [
+                'name' => 'webhook_secret',
+                'encrypted' => true,
+                'label' => 'Webhook Secret',
+                'type' => 'input'
+            ],
+            [
+                'name' => 'max_retry_attempts',
+                'label' => 'Maximum Retry Attempts',
+                'type' => 'input',
+                'default_value' => '3'
+            ]
+        ]);
+    }
+
+    /**
+     * Process the payment with validation and security checks
+     */
+    public function process_payment($data)
+    {
+        try {
+            // Log the payment data for debugging
+            $this->ci->paystack_model->add_payment_log([
+                'invoice_id' => $data['invoiceid'],
+                'amount' => $data['amount'],
+                'message' => 'Payment process initiated',
+                'log_type' => 'debug'
+            ]);
+
+            // Generate payment reference
+            $reference = 'INV_' . $data['invoiceid'] . '_' . time();
+
+            // Store transaction data
+            $transaction_data = [
+                'invoice_id' => $data['invoiceid'],
+                'reference' => $reference,
+                'email' => $data['client']->email,
+                'amount' => $data['amount'],
+                'status' => 'pending',
+                'transaction_date' => date('Y-m-d H:i:s')
+            ];
+
+            $this->ci->db->insert(db_prefix() . 'paystack_transactions', $transaction_data);
+
+            // Return HTML for the payment form
+            return $this->generate_payment_form($data, $reference);
+
+        } catch (Exception $e) {
+            // Log any errors
+            $this->ci->paystack_model->add_payment_log([
+                'invoice_id' => $data['invoiceid'],
+                'message' => 'Error: ' . $e->getMessage(),
+                'log_type' => 'error'
+            ]);
+
+            return false;
+        }
+    }
+
+    private function generate_payment_form($data, $reference)
+    {
+        $public_key = $this->getSetting('paystack_public_key');
+
+        $form = '
+        <div id="paystack-payment-form">
+            <script src="https://js.paystack.co/v1/inline.js"></script>
+            <button type="button" class="btn btn-success" onclick="payWithPaystack()">Pay with Paystack</button>
+            <script>
+                function payWithPaystack() {
+                    let handler = PaystackPop.setup({
+                        key: "' . $public_key . '",
+                        email: "' . $data['client']->email . '",
+                        amount: ' . ($data['amount'] * 100) . ', // Convert to kobo
+                        currency: "' . $data['currency'] . '",
+                        ref: "' . $reference . '",
+                        callback: function(response) {
+                            if(response.status == "success") {
+                                window.location.href = "' . site_url('paystack/verify_payment/') . '" + response.reference;
+                            }
+                        },
+                        onClose: function() {
+                            // Handle popup closed
+                            console.log("Payment window closed");
+                        }
+                    });
+                    handler.openIframe();
+                }
+            </script>
+        </div>';
+
+        return $form;
+    }
+
+    /**
+     * Record payment with additional validation
+     */
+    public function record_payment($invoice_id, $transaction)
+    {
+        // Validate transaction data
+        if (!$this->validate_transaction_data($transaction)) {
+            $this->log_error('Invalid transaction data for payment recording');
+            return false;
+        }
+
+        $payment_data = [
+            'amount' => $transaction['data']->amount / 100,
+            'invoiceid' => $invoice_id,
+            'paymentmode' => $this->getId(),
+            'transactionid' => $transaction['data']->reference,
+            'note' => 'Paystack Transaction Reference: ' . $transaction['data']->reference
+        ];
+
+        // Record payment
+        $this->ci->load->model('payments_model');
+        $payment_id = $this->ci->payments_model->add($payment_data);
+
+        if ($payment_id) {
+            $this->update_invoice_status($invoice_id);
+            $this->log_success($transaction['data']->reference, $payment_data['amount']);
+            return true;
+        }
+
+        $this->log_error('Failed to record payment for invoice #' . $invoice_id);
+        return false;
+    }
+
+    /**
+     * Make secure API request
+     */
+    protected function make_api_request($endpoint, $method = 'GET', $data = null)
+    {
+        $url = $this->api_url . $endpoint;
+        $secret_key = $this->get_secret_key();
+
+        $headers = [
+            'Authorization: Bearer ' . $secret_key,
+            'Cache-Control: no-cache'
+        ];
+
+        if ($data && in_array($method, ['POST', 'PUT'])) {
+            $headers[] = 'Content-Type: application/json';
+        }
+
+        $ch = curl_init();
+        curl_setopt_array($ch, [
+            CURLOPT_URL => $url,
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_SSL_VERIFYPEER => true,
+            CURLOPT_CUSTOMREQUEST => $method,
+            CURLOPT_HTTPHEADER => $headers
+        ]);
+
+        if ($data && in_array($method, ['POST', 'PUT'])) {
+            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
+        }
+
+        $response = curl_exec($ch);
+        $error = curl_error($ch);
+        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        curl_close($ch);
+
+        $this->log_api_request($endpoint, $method, $data, $http_code, $error);
+
+        if ($error) {
+            return [
+                'success' => false,
+                'message' => $error
+            ];
+        }
+
+        $result = json_decode($response);
+        if (!$result || !$result->status) {
+            return [
+                'success' => false,
+                'message' => isset($result->message) ? $result->message : 'Invalid response'
+            ];
+        }
+
+        return [
+            'success' => true,
+            'data' => $result
+        ];
+    }
+
+    /**
+     * Validation methods
+     */
+    protected function validate_payment_data($data)
+    {
+        $required_fields = ['amount', 'invoiceid', 'currency'];
+        foreach ($required_fields as $field) {
+            if (!isset($data[$field]) || empty($data[$field])) {
+                $this->log_error('Missing required field: ' . $field);
+                return false;
+            }
+        }
+        return true;
+    }
+
+    protected function validate_payment_amount($amount)
+    {
+        return is_numeric($amount) && $amount > 0;
+    }
+
+    protected function validate_payment_currency($currency)
+    {
+        $allowed_currencies = explode(',', get_option('currencies'));
+        return in_array(strtoupper($currency), $allowed_currencies);
+    }
+
+    public function verify_transaction($reference)
+    {
+        $secret_key = $this->decryptSetting('paystack_secret_key');
+
+        $ch = curl_init();
+        curl_setopt_array($ch, [
+            CURLOPT_URL => "https://api.paystack.co/transaction/verify/" . rawurlencode($reference),
+            CURLOPT_RETURNTRANSFER => true,
+            CURLOPT_SSL_VERIFYPEER => true,
+            CURLOPT_HTTPHEADER => [
+                "Authorization: Bearer " . $secret_key,
+                "Cache-Control: no-cache",
+            ],
+        ]);
+
+        $response = curl_exec($ch);
+        $err = curl_error($ch);
+        curl_close($ch);
+
+        if ($err) {
+            $this->ci->paystack_model->add_payment_log([
+                'message' => 'Verification Error: ' . $err,
+                'log_type' => 'error'
+            ]);
+            return [
+                'success' => false,
+                'message' => $err
+            ];
+        }
+
+        $result = json_decode($response);
+        return [
+            'success' => true,
+            'data' => $result->data
+        ];
+    }
+
+    /**
+     * Security methods
+     */
+    protected function encrypt_payment_data($data)
+    {
+        $this->ci->load->library('encryption');
+        return $this->ci->encryption->encrypt(serialize($data));
+    }
+
+    protected function decrypt_payment_data($encrypted_data)
+    {
+        if (!$encrypted_data) return false;
+
+        $this->ci->load->library('encryption');
+        $decrypted = $this->ci->encryption->decrypt($encrypted_data);
+        return $decrypted ? unserialize($decrypted) : false;
+    }
+
+    protected function get_secret_key()
+    {
+        $key_option = $this->test_mode ? 'paystack_test_secret_key' : 'paystack_live_secret_key';
+        return $this->decryptSetting($key_option);
+    }
+
+    /**
+     * Rate limiting
+     */
+    protected function check_rate_limit($invoice_id)
+    {
+        $max_attempts = get_option('max_retry_attempts');
+        $timeframe = 15; // minutes
+
+        $this->ci->load->model('paystack_model');
+        $attempts = $this->ci->paystack_model->get_recent_failed_attempts($invoice_id, $timeframe);
+
+        return $attempts < $max_attempts;
+    }
+
+    /**
+     * Logging methods
+     */
+    protected function log_payment_attempt($invoice_id, $amount)
+    {
+        $this->ci->load->model('paystack_model');
+        $this->ci->paystack_model->add_payment_log([
+            'invoice_id' => $invoice_id,
+            'amount' => $amount,
+            'log_type' => 'attempt',
+            'message' => 'Payment attempt initiated'
+        ]);
+    }
+
+    protected function log_api_request($endpoint, $method, $data, $http_code, $error = null)
+    {
+        $this->ci->load->model('paystack_model');
+        $this->ci->paystack_model->add_payment_log([
+            'log_type' => 'api_request',
+            'message' => json_encode([
+                'endpoint' => $endpoint,
+                'method' => $method,
+                'http_code' => $http_code,
+                'error' => $error
+            ])
+        ]);
+    }
+
+    protected function log_success($reference, $amount)
+    {
+        $this->ci->load->model('paystack_model');
+        $this->ci->paystack_model->add_payment_log([
+            'log_type' => 'success',
+            'message' => "Payment successful - Reference: $reference, Amount: $amount"
+        ]);
+    }
+
+    protected function log_error($message)
+    {
+        $this->ci->load->model('paystack_model');
+        $this->ci->paystack_model->add_payment_log([
+            'log_type' => 'error',
+            'message' => $message
+        ]);
+    }
+}

models/Paystack_model.php

@@ -0,0 +1,210 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+class Paystack_model extends App_Model
+{
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Get all transactions
+     */
+    public function get_transactions($filter = [])
+    {
+        $this->db->select('*');
+        $this->db->from(db_prefix() . 'paystack_transactions');
+
+        if (isset($filter['start_date']) && $filter['start_date']) {
+            $this->db->where('date_created >=', $filter['start_date'] . ' 00:00:00');
+        }
+
+        if (isset($filter['end_date']) && $filter['end_date']) {
+            $this->db->where('date_created <=', $filter['end_date'] . ' 23:59:59');
+        }
+
+        $this->db->order_by('date_created', 'desc');
+        return $this->db->get()->result_array();
+    }
+
+    /**
+     * Get payment statistics
+     */
+    public function get_payment_stats()
+    {
+        $stats = [
+            'total_transactions' => 0,
+            'successful_transactions' => 0,
+            'failed_transactions' => 0,
+            'total_amount' => 0,
+            'success_rate' => 0
+        ];
+
+        // Total transactions
+        $this->db->select('COUNT(*) as total');
+        $this->db->from(db_prefix() . 'paystack_transactions');
+        $stats['total_transactions'] = $this->db->get()->row()->total;
+
+        // Successful transactions
+        $this->db->select('COUNT(*) as total, SUM(amount) as amount');
+        $this->db->where('status', 'success');
+        $this->db->from(db_prefix() . 'paystack_transactions');
+        $result = $this->db->get()->row();
+        $stats['successful_transactions'] = $result->total;
+        $stats['total_amount'] = $result->amount;
+
+        // Failed transactions
+        $this->db->select('COUNT(*) as total');
+        $this->db->where('status', 'failed');
+        $this->db->from(db_prefix() . 'paystack_transactions');
+        $stats['failed_transactions'] = $this->db->get()->row()->total;
+
+        // Calculate success rate
+        if ($stats['total_transactions'] > 0) {
+            $stats['success_rate'] = ($stats['successful_transactions'] / $stats['total_transactions']) * 100;
+        }
+
+        return $stats;
+    }
+
+    /**
+     * Get monthly chart data
+     */
+    public function get_monthly_chart_data()
+    {
+        $months = [];
+        for ($m = 11; $m >= 0; $m--) {
+            $months[date('Y-m', strtotime("-$m months"))] = [
+                'successful' => 0,
+                'failed' => 0,
+                'amount' => 0
+            ];
+        }
+
+        $this->db->select('DATE_FORMAT(date_created, "%Y-%m") as month, status, COUNT(*) as total, SUM(amount) as amount');
+        $this->db->from(db_prefix() . 'paystack_transactions');
+        $this->db->where('date_created >= DATE_SUB(NOW(), INTERVAL 12 MONTH)');
+        $this->db->group_by('month, status');
+        $results = $this->db->get()->result_array();
+
+        foreach ($results as $result) {
+            if (isset($months[$result['month']])) {
+                if ($result['status'] == 'success') {
+                    $months[$result['month']]['successful'] = $result['total'];
+                    $months[$result['month']]['amount'] = $result['amount'];
+                } else {
+                    $months[$result['month']]['failed'] = $result['total'];
+                }
+            }
+        }
+
+        return $months;
+    }
+
+    /**
+     * Get recent transactions
+     */
+    public function get_recent_transactions($limit = 10)
+    {
+        $this->db->select('t.*, i.number as invoice_number');
+        $this->db->from(db_prefix() . 'paystack_transactions t');
+        $this->db->join(db_prefix() . 'invoices i', 'i.id = t.invoice_id', 'left');
+        $this->db->order_by('t.date_created', 'desc');
+        $this->db->limit($limit);
+        return $this->db->get()->result_array();
+    }
+
+    /**
+     * Add transaction log
+     */
+    public function add_log($data)
+    {
+        $this->db->insert(db_prefix() . 'paystack_payment_logs', $data);
+        return $this->db->insert_id();
+    }
+
+    /**
+     * Get transaction by reference
+     */
+    public function get_transaction_by_reference($reference)
+    {
+        $this->db->where('reference', $reference);
+        return $this->db->get(db_prefix() . 'paystack_transactions')->row_array();
+    }
+
+    /**
+     * Add webhook log
+     */
+    public function add_webhook_log($event, $payload, $status)
+    {
+        return $this->db->insert(db_prefix() . 'paystack_webhook_logs', [
+            'event' => $event,
+            'payload' => json_encode($payload),
+            'status' => $status
+        ]);
+    }
+
+    /**
+     * Update settings
+     */
+    public function update_settings($data)
+    {
+        foreach ($data as $key => $value) {
+            update_option($key, $value);
+        }
+        return true;
+    }
+
+    /**
+     * Get recent failed attempts
+     */
+    public function get_recent_failed_attempts($invoice_id, $timeframe)
+    {
+        $this->db->where('invoice_id', $invoice_id);
+        $this->db->where('log_type', 'failed_attempt');
+        $this->db->where('date_created >=', date('Y-m-d H:i:s', strtotime("-$timeframe minutes")));
+        return $this->db->count_all_results(db_prefix() . 'paystack_payment_logs');
+    }
+
+    /**
+     * Add payment log with enhanced details
+     */
+    public function add_payment_log($data)
+    {
+        // Ensure required fields
+        $data['date_created'] = date('Y-m-d H:i:s');
+
+        // Add client IP if available
+        if (!isset($data['ip_address']) && isset($_SERVER['REMOTE_ADDR'])) {
+            $data['ip_address'] = $_SERVER['REMOTE_ADDR'];
+        }
+
+        // Add user agent if available
+        if (!isset($data['user_agent']) && isset($_SERVER['HTTP_USER_AGENT'])) {
+            $data['user_agent'] = $_SERVER['HTTP_USER_AGENT'];
+        }
+
+        return $this->db->insert(db_prefix() . 'paystack_payment_logs', $data);
+    }
+
+    /**
+     * Get transaction logs
+     */
+    public function get_transaction_logs($transaction_id)
+    {
+        $this->db->where('transaction_id', $transaction_id);
+        $this->db->order_by('date_created', 'desc');
+        return $this->db->get(db_prefix() . 'paystack_payment_logs')->result_array();
+    }
+
+    /**
+     * Clean old logs
+     */
+    public function clean_old_logs($days = 90)
+    {
+        $this->db->where('date_created <', date('Y-m-d H:i:s', strtotime("-$days days")));
+        return $this->db->delete(db_prefix() . 'paystack_payment_logs');
+    }
+}

paystack.php

@@ -0,0 +1,84 @@
+<?php
+
+defined('BASEPATH') or exit('No direct script access allowed');
+
+/*
+Module Name: Paystack Payment Gateway
+Description: Payment gateway integration for processing payments through Paystack
+Version: 1.0.0
+Requires at least: 2.3.4
+Author: [Your Name]
+Author URI: [Your Website]
+*/
+
+define('PAYSTACK_MODULE_NAME', 'PAYSTACK');
+
+/**
+ * Activation hook
+ */
+function paystack_activation_hook()
+{
+    $CI = &get_instance();
+    require_once(__DIR__ . '/install.php');
+}
+
+/**
+ * Add menu items for Paystack
+ * @return null
+ */
+function paystack_init_menu_items()
+{
+    $CI = &get_instance();
+
+    // Main Menu Item
+    if (has_permission('payments', '', 'view')) {
+        $CI->app_menu->add_sidebar_menu_item('paystack', [
+            'name' => 'Paystack',
+            'position' => 30,
+            'icon' => 'fa fa-credit-card',
+        ]);
+
+        // Sub Menu Items
+        $CI->app_menu->add_sidebar_children_item('paystack', [
+            'slug' => 'paystack-dashboard',
+            'name' => _l('dashboard'),
+            'href' => admin_url('paystack/admin/dashboard'),
+            'position' => 1,
+        ]);
+
+        $CI->app_menu->add_sidebar_children_item('paystack', [
+            'slug' => 'paystack-transactions',
+            'name' => _l('transactions'),
+            'href' => admin_url('paystack/admin/transactions'),
+            'position' => 5,
+        ]);
+    }
+
+    // Settings Menu Item
+    if (has_permission('settings', '', 'view')) {
+        $CI->app_menu->add_setup_menu_item('paystack-settings', [
+            'name' => _l('paystack_settings'),
+            'href' => admin_url('paystack/admin/settings'),
+            'position' => 65,
+            'icon' => 'fa fa-credit-card',
+        ]);
+
+        $CI->app_menu->add_setup_menu_item('paystack-test-mode', [
+            'parent' => 'paystack-settings',
+            'name' => _l('test_mode'),
+            'href' => admin_url('paystack/admin/test_mode'),
+            'position' => 5,
+        ]);
+    }
+}
+
+// Register activation hook
+register_activation_hook('paystack', 'paystack_activation_hook');
+
+// Register payment gateway
+register_payment_gateway('paystack_gateway', 'paystack');
+
+// Add menu items
+hooks()->add_action('admin_init', 'paystack_init_menu_items');
+
+register_language_files(PAYSTACK_MODULE_NAME, [PAYSTACK_MODULE_NAME]);

views/admin/dashboard.php

@@ -0,0 +1,178 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
+<?php init_head(); ?>
+<div id="wrapper">
+    <div class="content">
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel_s">
+                    <div class="panel-body">
+                        <h4 class="no-margin"><?php echo _l('paystack_dashboard'); ?></h4>
+                        <hr class="hr-panel-heading" />
+
+                        <!-- Stats Widgets -->
+                        <div class="row">
+                            <div class="col-md-3">
+                                <div class="widget-box">
+                                    <div class="widget-header">
+                                        <h3><?php echo _l('total_transactions'); ?></h3>
+                                    </div>
+                                    <div class="widget-content">
+                                        <h3 class="bold"><?php echo $stats['total_transactions']; ?></h3>
+                                    </div>
+                                </div>
+                            </div>
+                            <div class="col-md-3">
+                                <div class="widget-box success-bg">
+                                    <div class="widget-header">
+                                        <h3><?php echo _l('successful_transactions'); ?></h3>
+                                    </div>
+                                    <div class="widget-content">
+                                        <h3 class="bold"><?php echo $stats['successful_transactions']; ?></h3>
+                                    </div>
+                                </div>
+                            </div>
+                            <div class="col-md-3">
+                                <div class="widget-box warning-bg">
+                                    <div class="widget-header">
+                                        <h3><?php echo _l('failed_transactions'); ?></h3>
+                                    </div>
+                                    <div class="widget-content">
+                                        <h3 class="bold"><?php echo $stats['failed_transactions']; ?></h3>
+                                    </div>
+                                </div>
+                            </div>
+                            <div class="col-md-3">
+                                <div class="widget-box info-bg">
+                                    <div class="widget-header">
+                                        <h3><?php echo _l('total_amount'); ?></h3>
+                                    </div>
+                                    <div class="widget-content">
+                                        <h3 class="bold"><?php echo app_format_money($stats['total_amount'], get_base_currency()); ?></h3>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+
+                        <div class="row mtop20">
+                            <!-- Monthly Chart -->
+                            <div class="col-md-8">
+                                <div class="panel_s">
+                                    <div class="panel-body">
+                                        <h4 class="no-margin"><?php echo _l('monthly_transactions'); ?></h4>
+                                        <hr class="hr-panel-heading" />
+                                        <canvas id="monthly-chart" height="300"></canvas>
+                                    </div>
+                                </div>
+                            </div>
+
+                            <!-- Success Rate -->
+                            <div class="col-md-4">
+                                <div class="panel_s">
+                                    <div class="panel-body">
+                                        <h4 class="no-margin"><?php echo _l('success_rate'); ?></h4>
+                                        <hr class="hr-panel-heading" />
+                                        <canvas id="success-rate-chart" height="300"></canvas>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+
+                        <!-- Recent Transactions -->
+                        <div class="panel_s mtop20">
+                            <div class="panel-body">
+                                <h4 class="no-margin"><?php echo _l('recent_transactions'); ?></h4>
+                                <hr class="hr-panel-heading" />
+                                <table class="table dt-table table-recent-transactions">
+                                    <thead>
+                                    <tr>
+                                        <th><?php echo _l('date'); ?></th>
+                                        <th><?php echo _l('reference'); ?></th>
+                                        <th><?php echo _l('invoice_number'); ?></th>
+                                        <th><?php echo _l('amount'); ?></th>
+                                        <th><?php echo _l('status'); ?></th>
+                                    </tr>
+                                    </thead>
+                                    <tbody>
+                                    <?php foreach($recent_transactions as $transaction) { ?>
+                                        <tr>
+                                            <td><?php echo _dt($transaction['date']); ?></td>
+                                            <td><?php echo $transaction['reference']; ?></td>
+                                            <td>
+                                                <a href="<?php echo admin_url('invoices/list_invoices/'.$transaction['invoice_id']); ?>">
+                                                    <?php echo format_invoice_number($transaction['invoice_number']); ?>
+                                                </a>
+                                            </td>
+                                            <td><?php echo app_format_money($transaction['amount'], get_base_currency()); ?></td>
+                                            <td>
+                                                <span class="label label-<?php echo $transaction['status'] == 'success' ? 'success' : 'danger'; ?>">
+                                                    <?php echo _l($transaction['status']); ?>
+                                                </span>
+                                            </td>
+                                        </tr>
+                                    <?php } ?>
+                                    </tbody>
+                                </table>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+<?php init_tail(); ?>
+<script>
+    // Monthly Chart
+    var ctx = document.getElementById('monthly-chart').getContext('2d');
+    var monthlyChart = new Chart(ctx, {
+        type: 'bar',
+        data: {
+            labels: <?php echo json_encode(array_keys($monthly_chart)); ?>,
+            datasets: [{
+                label: '<?php echo _l("successful_transactions"); ?>',
+                data: <?php echo json_encode(array_column($monthly_chart, 'successful')); ?>,
+                backgroundColor: 'rgba(75, 192, 192, 0.2)',
+                borderColor: 'rgba(75, 192, 192, 1)',
+                borderWidth: 1
+            },
+                {
+                    label: '<?php echo _l("failed_transactions"); ?>',
+                    data: <?php echo json_encode(array_column($monthly_chart, 'failed')); ?>,
+                    backgroundColor: 'rgba(255, 99, 132, 0.2)',
+                    borderColor: 'rgba(255, 99, 132, 1)',
+                    borderWidth: 1
+                }]
+        },
+        options: {
+            scales: {
+                y: {
+                    beginAtZero: true
+                }
+            }
+        }
+    });
+
+    // Success Rate Chart
+    var ctx2 = document.getElementById('success-rate-chart').getContext('2d');
+    var successRateChart = new Chart(ctx2, {
+        type: 'doughnut',
+        data: {
+            labels: ['<?php echo _l("successful"); ?>', '<?php echo _l("failed"); ?>'],
+            datasets: [{
+                data: [
+                    <?php echo $stats['successful_transactions']; ?>,
+                    <?php echo $stats['failed_transactions']; ?>
+                ],
+                backgroundColor: [
+                    'rgba(75, 192, 192, 0.2)',
+                    'rgba(255, 99, 132, 0.2)'
+                ],
+                borderColor: [
+                    'rgba(75, 192, 192, 1)',
+                    'rgba(255, 99, 132, 1)'
+                ],
+                borderWidth: 1
+            }]
+        }
+    });
+</script>

views/admin/settings.php

@@ -0,0 +1,104 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
+<?php init_head(); ?>
+<div id="wrapper">
+    <div class="content">
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel_s">
+                    <div class="panel-body">
+                        <?php echo form_open(admin_url('paystack/admin/settings')); ?>
+                        <div class="tab-content mtop15">
+                            <!-- Settings Tab -->
+                            <div class="tab-pane<?php if($tab == 'settings'){echo ' active';} ?>" id="settings">
+                                <div class="form-group">
+                                    <label for="paystack_live_public_key"><?php echo _l('live_public_key'); ?></label>
+                                    <input type="text" class="form-control" id="paystack_live_public_key"
+                                           name="paystack_live_public_key"
+                                           value="<?php echo get_option('paystack_live_public_key'); ?>">
+                                </div>
+
+                                <div class="form-group">
+                                    <label for="paystack_live_secret_key"><?php echo _l('live_secret_key'); ?></label>
+                                    <input type="password" class="form-control" id="paystack_live_secret_key"
+                                           name="paystack_live_secret_key"
+                                           value="<?php echo get_option('paystack_live_secret_key'); ?>">
+                                </div>
+
+                                <div class="form-group">
+                                    <label for="paystack_webhook_secret"><?php echo _l('webhook_secret'); ?></label>
+                                    <input type="password" class="form-control" id="paystack_webhook_secret"
+                                           name="paystack_webhook_secret"
+                                           value="<?php echo get_option('paystack_webhook_secret'); ?>">
+                                </div>
+
+                                <div class="form-group">
+                                    <label for="paystack_default_description"><?php echo _l('default_description'); ?></label>
+                                    <textarea class="form-control" id="paystack_default_description"
+                                              name="paystack_default_description" rows="3"><?php echo get_option('paystack_default_description'); ?></textarea>
+                                    <small class="text-muted"><?php echo _l('default_description_help'); ?></small>
+                                </div>
+                            </div>
+
+                            <!-- Test Mode Tab -->
+                            <div class="tab-pane<?php if($tab == 'test_mode'){echo ' active';} ?>" id="test_mode">
+                                <div class="form-group">
+                                    <label for="paystack_test_public_key"><?php echo _l('test_public_key'); ?></label>
+                                    <input type="text" class="form-control" id="paystack_test_public_key"
+                                           name="paystack_test_public_key"
+                                           value="<?php echo get_option('paystack_test_public_key'); ?>">
+                                </div>
+
+                                <div class="form-group">
+                                    <label for="paystack_test_secret_key"><?php echo _l('test_secret_key'); ?></label>
+                                    <input type="password" class="form-control" id="paystack_test_secret_key"
+                                           name="paystack_test_secret_key"
+                                           value="<?php echo get_option('paystack_test_secret_key'); ?>">
+                                </div>
+
+                                <div class="form-group">
+                                    <label class="control-label">
+                                        <div class="checkbox checkbox-primary">
+                                            <input type="checkbox" name="paystack_test_mode" id="paystack_test_mode"
+                                                <?php if(get_option('paystack_test_mode') == 1){echo 'checked';} ?>>
+                                            <label for="paystack_test_mode"><?php echo _l('enable_test_mode'); ?></label>
+                                        </div>
+                                    </label>
+                                </div>
+
+                                <div class="alert alert-info">
+                                    <?php echo _l('test_mode_notice'); ?>
+                                </div>
+                            </div>
+                        </div>
+
+                        <div class="btn-bottom-toolbar text-right">
+                            <button type="submit" class="btn btn-primary"><?php echo _l('save'); ?></button>
+                        </div>
+                        <?php echo form_close(); ?>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+<?php init_tail(); ?>
+
+<script>
+    $(function() {
+        // Toggle test mode fields
+        $('#paystack_test_mode').on('change', function() {
+            if($(this).is(':checked')) {
+                $('#test_keys').removeClass('hide');
+            } else {
+                $('#test_keys').addClass('hide');
+            }
+        });
+
+        // Copy webhook URL to clipboard
+        $('#webhook_url').on('click', function() {
+            $(this).select();
+            document.execCommand('copy');
+            alert_float('success', '<?php echo _l("webhook_url_copied"); ?>');
+        });
+    });
+</script>

views/admin/test_mode.php

@@ -0,0 +1,228 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
+<?php init_head(); ?>
+<div id="wrapper">
+    <div class="content">
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel_s">
+                    <div class="panel-body">
+                        <h4 class="no-margin">
+                            <?php echo _l('paystack_test_mode'); ?>
+                            <?php if(get_option('paystack_test_mode')): ?>
+                                <span class="label label-warning"><?php echo _l('test_mode_enabled'); ?></span>
+                            <?php endif; ?>
+                        </h4>
+                        <hr class="hr-panel-heading" />
+
+                        <!-- Test Mode Warning -->
+                        <div class="alert alert-warning">
+                            <h4><i class="fa fa-warning"></i> <?php echo _l('test_mode_warning'); ?></h4>
+                            <?php echo _l('test_mode_description'); ?>
+                        </div>
+
+                        <!-- Test Transaction -->
+                        <div class="panel_s">
+                            <div class="panel-body">
+                                <h4 class="no-margin"><?php echo _l('test_transaction'); ?></h4>
+                                <hr class="hr-panel-heading" />
+
+                                <div class="row">
+                                    <div class="col-md-6">
+                                        <div class="form-group">
+                                            <label for="test_amount"><?php echo _l('amount'); ?></label>
+                                            <input type="number" class="form-control" id="test_amount" value="1000">
+                                        </div>
+                                        <div class="form-group">
+                                            <label for="test_email"><?php echo _l('email'); ?></label>
+                                            <input type="email" class="form-control" id="test_email" value="test@example.com">
+                                        </div>
+                                        <button type="button" class="btn btn-info" onclick="initiate_test_payment()">
+                                            <?php echo _l('initiate_test_payment'); ?>
+                                        </button>
+                                    </div>
+                                    <div class="col-md-6">
+                                        <div class="alert alert-info">
+                                            <h4><?php echo _l('test_cards'); ?></h4>
+                                            <p><strong><?php echo _l('successful_payment'); ?>:</strong></p>
+                                            <pre>Card Number: 4084 0840 8408 4081
+Expiry: 01/25
+CVV: 408</pre>
+                                            <p><strong><?php echo _l('failed_payment'); ?>:</strong></p>
+                                            <pre>Card Number: 4084 0840 8408 4080
+Expiry: 01/25
+CVV: 408</pre>
+                                        </div>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+
+                        <!-- Test Webhook -->
+                        <div class="panel_s">
+                            <div class="panel-body">
+                                <h4 class="no-margin"><?php echo _l('test_webhook'); ?></h4>
+                                <hr class="hr-panel-heading" />
+
+                                <div class="row">
+                                    <div class="col-md-6">
+                                        <p><?php echo _l('webhook_url'); ?>:</p>
+                                        <div class="input-group">
+                                            <input type="text" class="form-control" id="webhook_url" readonly
+                                                   value="<?php echo site_url('paystack/webhook'); ?>">
+                                            <span class="input-group-btn">
+                                                <button class="btn btn-default" type="button" onclick="copy_webhook_url()">
+                                                    <i class="fa fa-copy"></i>
+                                                </button>
+                                            </span>
+                                        </div>
+                                        <div class="mtop15">
+                                            <button type="button" class="btn btn-info" onclick="test_webhook()">
+                                                <?php echo _l('test_webhook_connection'); ?>
+                                            </button>
+                                        </div>
+                                    </div>
+                                    <div class="col-md-6">
+                                        <div id="webhook_test_result"></div>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+
+                        <!-- Debug Log -->
+                        <div class="panel_s">
+                            <div class="panel-body">
+                                <h4 class="no-margin"><?php echo _l('debug_log'); ?></h4>
+                                <hr class="hr-panel-heading" />
+
+                                <div class="row">
+                                    <div class="col-md-12">
+                                        <textarea class="form-control" id="debug_log" rows="10" readonly></textarea>
+                                        <div class="mtop15">
+                                            <button type="button" class="btn btn-danger" onclick="clear_debug_log()">
+                                                <?php echo _l('clear_log'); ?>
+                                            </button>
+                                        </div>
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+<?php init_tail(); ?>
+<script>
+    // Initiate test payment
+    function initiate_test_payment() {
+        var amount = $('#test_amount').val();
+        var email = $('#test_email').val();
+
+        $.post(admin_url + 'paystack/admin/initiate_test_payment', {
+            amount: amount,
+            email: email
+        }).done(function(response) {
+            var data = JSON.parse(response);
+            if(data.success) {
+                // Open Paystack popup
+                let handler = PaystackPop.setup({
+                    key: '<?php echo get_option("paystack_test_public_key"); ?>',
+                    email: email,
+                    amount: amount * 100,
+                    ref: data.reference,
+                    callback: function(response) {
+                        log_debug('Test payment completed: ' + response.reference);
+                        alert_float('success', '<?php echo _l("test_payment_successful"); ?>');
+                    },
+                    onClose: function() {
+                        log_debug('Test payment cancelled');
+                        alert_float('warning', '<?php echo _l("test_payment_cancelled"); ?>');
+                    }
+                });
+                handler.openIframe();
+            } else {
+                alert_float('danger', data.message);
+            }
+        });
+    }
+
+    // Test webhook
+    function test_webhook() {
+        $('#webhook_test_result').html('<div class="alert alert-info"><?php echo _l("testing_webhook"); ?></div>');
+        $.post(admin_url + 'paystack/admin/test_webhook')
+            .done(function(response) {
+                var data = JSON.parse(response);
+                if(data.success) {
+                    $('#webhook_test_result').html(
+                        '<div class="alert alert-success">' +
+                        '<h4><i class="fa fa-check"></i> <?php echo _l("webhook_test_successful"); ?></h4>' +
+                        '<p>' + data.message + '</p>' +
+                        '</div>'
+                    );
+                    log_debug('Webhook test successful: ' + data.message);
+                } else {
+                    $('#webhook_test_result').html(
+                        '<div class="alert alert-danger">' +
+                        '<h4><i class="fa fa-times"></i> <?php echo _l("webhook_test_failed"); ?></h4>' +
+                        '<p>' + data.message + '</p>' +
+                        '</div>'
+                    );
+                    log_debug('Webhook test failed: ' + data.message);
+                }
+            })
+            .fail(function(xhr) {
+                $('#webhook_test_result').html(
+                    '<div class="alert alert-danger">' +
+                    '<h4><i class="fa fa-times"></i> <?php echo _l("webhook_test_failed"); ?></h4>' +
+                    '<p><?php echo _l("connection_failed"); ?></p>' +
+                    '</div>'
+                );
+                log_debug('Webhook test failed: Connection error');
+            });
+    }
+
+    // Copy webhook URL
+    function copy_webhook_url() {
+        var copyText = document.getElementById("webhook_url");
+        copyText.select();
+        document.execCommand("copy");
+        alert_float('success', '<?php echo _l("webhook_url_copied"); ?>');
+    }
+
+    // Debug logging
+    function log_debug(message) {
+        var now = new Date().toISOString();
+        var current = $('#debug_log').val();
+        $('#debug_log').val(current + now + ': ' + message + "\n");
+
+        // Save to server
+        $.post(admin_url + 'paystack/admin/log_debug', {
+            message: message
+        });
+    }
+
+    // Clear debug log
+    function clear_debug_log() {
+        if(confirm('<?php echo _l("confirm_clear_log"); ?>')) {
+            $('#debug_log').val('');
+            $.post(admin_url + 'paystack/admin/clear_debug_log');
+            alert_float('success', '<?php echo _l("log_cleared"); ?>');
+        }
+    }
+
+    // Load initial debug log
+    function load_debug_log() {
+        $.get(admin_url + 'paystack/admin/get_debug_log', function(response) {
+            $('#debug_log').val(response);
+        });
+    }
+
+    // Initialize
+    $(function() {
+        load_debug_log();
+
+        // Refresh debug log every 30 seconds
+        setInterval(load_debug_log, 30000);
+    });
+</script>

views/admin/transactions.php

@@ -0,0 +1,169 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
+<?php init_head(); ?>
+<div id="wrapper">
+    <div class="content">
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel_s">
+                    <div class="panel-body">
+                        <h4 class="no-margin">
+                            <?php echo _l('paystack_transactions'); ?>
+                        </h4>
+                        <hr class="hr-panel-heading" />
+
+                        <!-- Filters -->
+                        <div class="row">
+                            <div class="col-md-12">
+                                <?php echo form_open('', ['method' => 'GET']); ?>
+                                <div class="col-md-3">
+                                    <?php echo render_date_input('start_date', 'start_date', $this->input->get('start_date')); ?>
+                                </div>
+                                <div class="col-md-3">
+                                    <?php echo render_date_input('end_date', 'end_date', $this->input->get('end_date')); ?>
+                                </div>
+                                <div class="col-md-3">
+                                    <div class="form-group">
+                                        <label for="status"><?php echo _l('status'); ?></label>
+                                        <select name="status" id="status" class="selectpicker" data-width="100%">
+                                            <option value=""><?php echo _l('all'); ?></option>
+                                            <option value="success" <?php if($this->input->get('status') == 'success'){echo 'selected';} ?>>
+                                                <?php echo _l('success'); ?>
+                                            </option>
+                                            <option value="failed" <?php if($this->input->get('status') == 'failed'){echo 'selected';} ?>>
+                                                <?php echo _l('failed'); ?>
+                                            </option>
+                                        </select>
+                                    </div>
+                                </div>
+                                <div class="col-md-3 mtop25">
+                                    <button type="submit" class="btn btn-primary"><?php echo _l('filter'); ?></button>
+                                    <a href="<?php echo admin_url('paystack/admin/transactions'); ?>" class="btn btn-default">
+                                        <?php echo _l('clear'); ?>
+                                    </a>
+                                </div>
+                                <?php echo form_close(); ?>
+                            </div>
+                        </div>
+
+                        <div class="clearfix mtop20"></div>
+
+                        <!-- Transactions Table -->
+                        <table class="table dt-table table-transactions">
+                            <thead>
+                            <tr>
+                                <th><?php echo _l('date'); ?></th>
+                                <th><?php echo _l('reference'); ?></th>
+                                <th><?php echo _l('invoice_dt_number'); ?></th>
+                                <th><?php echo _l('client'); ?></th>
+                                <th><?php echo _l('amount'); ?></th>
+                                <th><?php echo _l('status'); ?></th>
+                                <th><?php echo _l('options'); ?></th>
+                            </tr>
+                            </thead>
+                            <tbody>
+                            <?php foreach($transactions as $transaction) { ?>
+                                <tr>
+                                    <td><?php echo _dt($transaction['date']); ?></td>
+                                    <td><?php echo $transaction['reference']; ?></td>
+                                    <td>
+                                        <a href="<?php echo admin_url('invoices/list_invoices/' . $transaction['invoice_id']); ?>">
+                                            <?php echo format_invoice_number($transaction['invoice_id']); ?>
+                                        </a>
+                                    </td>
+                                    <td><?php echo $transaction['email']; ?></td>
+                                    <td><?php echo app_format_money($transaction['amount'], get_base_currency()); ?></td>
+                                    <td>
+                                        <?php
+                                        $status_class = 'default';
+                                        if($transaction['status'] == 'success') {
+                                            $status_class = 'success';
+                                        } else if($transaction['status'] == 'failed') {
+                                            $status_class = 'danger';
+                                        }
+                                        ?>
+                                        <span class="label label-<?php echo $status_class; ?>">
+                                            <?php echo _l($transaction['status']); ?>
+                                        </span>
+                                    </td>
+                                    <td>
+                                        <a href="#" class="btn btn-default btn-icon" onclick="view_transaction(<?php echo $transaction['id']; ?>)">
+                                            <i class="fa fa-eye"></i>
+                                        </a>
+                                    </td>
+                                </tr>
+                            <?php } ?>
+                            </tbody>
+                        </table>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<!-- Transaction Details Modal -->
+<div class="modal fade" id="transaction_modal" tabindex="-1" role="dialog">
+    <div class="modal-dialog">
+        <div class="modal-content">
+            <div class="modal-header">
+                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
+                <h4 class="modal-title"><?php echo _l('transaction_details'); ?></h4>
+            </div>
+            <div class="modal-body">
+                <div class="row">
+                    <div class="col-md-12">
+                        <table class="table table-striped">
+                            <tbody>
+                            <tr>
+                                <td><strong><?php echo _l('reference'); ?>:</strong></td>
+                                <td id="td_reference"></td>
+                            </tr>
+                            <tr>
+                                <td><strong><?php echo _l('amount'); ?>:</strong></td>
+                                <td id="td_amount"></td>
+                            </tr>
+                            <tr>
+                                <td><strong><?php echo _l('status'); ?>:</strong></td>
+                                <td id="td_status"></td>
+                            </tr>
+                            <tr>
+                                <td><strong><?php echo _l('date'); ?>:</strong></td>
+                                <td id="td_date"></td>
+                            </tr>
+                            <tr>
+                                <td><strong><?php echo _l('email'); ?>:</strong></td>
+                                <td id="td_email"></td>
+                            </tr>
+                            </tbody>
+                        </table>
+                    </div>
+                </div>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-default" data-dismiss="modal"><?php echo _l('close'); ?></button>
+            </div>
+        </div>
+    </div>
+</div>
+
+<?php init_tail(); ?>
+<script>
+    function view_transaction(id) {
+        $.get(admin_url + 'paystack/admin/get_transaction_details/' + id, function(response) {
+            var data = JSON.parse(response);
+            $('#td_reference').html(data.reference);
+            $('#td_amount').html(format_money(data.amount));
+            $('#td_status').html(data.status);
+            $('#td_date').html(data.date);
+            $('#td_email').html(data.email);
+            $('#transaction_modal').modal('show');
+        });
+    }
+
+    $(function() {
+        var TableTransactions = $('.table-transactions').DataTable({
+            "order": [[ 0, "desc" ]],
+            "pageLength": 25
+        });
+    });
+</script>

views/payment.php

@@ -0,0 +1,101 @@
+<?php defined('BASEPATH') or exit('No direct script access allowed'); ?>
+<?php echo payment_gateway_head(_l('payment_for_invoice') . ' ' . format_invoice_number($invoice->id)); ?>
+
+<body class="gateway-payment">
+<div class="container">
+    <div class="col-md-8 col-md-offset-2 mtop30">
+        <!-- Payment Header -->
+        <div class="mbot30 text-center">
+            <h2 class="bold"><?php echo _l('payment_for_invoice'); ?></h2>
+            <h3 class="bold"><?php echo format_invoice_number($invoice->id); ?></h3>
+        </div>
+
+        <!-- Invoice Details -->
+        <div class="row">
+            <div class="col-md-8 col-md-offset-2">
+                <div class="panel panel-default">
+                    <div class="panel-heading">
+                        <h4 class="panel-title"><?php echo _l('invoice_details'); ?></h4>
+                    </div>
+                    <div class="panel-body">
+                        <div class="row">
+                            <div class="col-md-6">
+                                <p><strong><?php echo _l('invoice_date'); ?>:</strong><br>
+                                    <?php echo _d($invoice->date); ?>
+                                </p>
+                                <p><strong><?php echo _l('due_date'); ?>:</strong><br>
+                                    <?php echo _d($invoice->duedate); ?>
+                                </p>
+                            </div>
+                            <div class="col-md-6">
+                                <p><strong><?php echo _l('invoice_total'); ?>:</strong><br>
+                                    <?php echo app_format_money($invoice->total, $invoice->currency_name); ?>
+                                </p>
+                                <p><strong><?php echo _l('amount_due'); ?>:</strong><br>
+                                    <?php echo app_format_money($payment_data['amount'], $payment_data['currency']); ?>
+                                </p>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <!-- Payment Button -->
+        <div class="row">
+            <div class="col-md-8 col-md-offset-2">
+                <div class="panel panel-default">
+                    <div class="panel-heading">
+                        <h4 class="panel-title"><?php echo _l('payment_details'); ?></h4>
+                    </div>
+                    <div class="panel-body">
+                        <div id="payment-loading" class="text-center hide">
+                            <i class="fa fa-spinner fa-spin fa-3x"></i><br />
+                            <?php echo _l('processing_payment'); ?>
+                        </div>
+                        <button type="button" id="payWithPaystack" class="btn btn-success btn-block btn-lg">
+                            <i class="fa fa-lock pad-right-sm"></i> <?php echo _l('pay_securely'); ?>
+                        </button>
+                        <div class="mtop15 text-center">
+                            <img src="<?php echo module_dir_url('paystack', 'assets/img/secured-by-paystack.png'); ?>"
+                                 alt="Secured by Paystack" style="max-height: 40px;">
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<script src="https://js.paystack.co/v1/inline.js"></script>
+<script>
+    document.getElementById('payWithPaystack').onclick = function() {
+        // Show loading
+        document.getElementById('payment-loading').classList.remove('hide');
+        this.disabled = true;
+
+        let handler = PaystackPop.setup({
+            key: '<?php echo $this->paystack_gateway->getSetting('paystack_public_key'); ?>',
+            email: '<?php echo $client->email; ?>',
+            amount: <?php echo $payment_data['amount'] * 100; ?>,
+            currency: '<?php echo $payment_data['currency']; ?>',
+            ref: '<?php echo 'INV_' . $invoice->id . '_' . time(); ?>',
+            metadata: {
+                invoice_id: '<?php echo $invoice->id; ?>',
+                client_id: '<?php echo $invoice->clientid; ?>'
+            },
+            callback: function(response) {
+                window.location.href = '<?php echo site_url('paystack/verify_payment/'); ?>' + response.reference;
+            },
+            onClose: function() {
+                // Hide loading and enable button
+                document.getElementById('payment-loading').classList.add('hide');
+                document.getElementById('payWithPaystack').disabled = false;
+                alert('<?php echo _l('payment_cancelled'); ?>');
+            }
+        });
+        handler.openIframe();
+    }
+</script>
+</body>
+</html>