forminator-paystack-integration.php

<?php
/**
 * Plugin Name: Forminator Paystack Integration
 * Description: Integrates Paystack payment with Forminator forms.
 * Version: 1.0.1
 * Author: Frank Orac
 */

// Define plugin constants
define('FORMINATOR_PAYSTACK_VERSION', '1.0.1');
define('FORMINATOR_PAYSTACK_PATH', plugin_dir_path(__FILE__));
define('FORMINATOR_PAYSTACK_URL', plugin_dir_url(__FILE__));
define('FORMINATOR_PAYSTACK_OPTION', 'forminator_paystack_settings');

// Load settings
function forminator_paystack_get_settings() {
    $defaults = [
        'form_id'       => 8539,
        'amount_field'  => 'calculation-2',
        'email_field'   => 'email-1',
        'public_key'    => 'pk_test_',
        'secret_key'    => 'sk_test_',
        'callback_url'  => 'https://',
        'test_mode'     => 'yes',
    ];
    
    $settings = get_option(FORMINATOR_PAYSTACK_OPTION, []);
    return wp_parse_args($settings, $defaults);
}

// Enqueue frontend scripts
add_action('wp_enqueue_scripts', function () {
    $settings = forminator_paystack_get_settings();
    
    wp_enqueue_script('forminator-paystack', FORMINATOR_PAYSTACK_URL . 'assets/js/forminator-paystack.js', ['jquery'], FORMINATOR_PAYSTACK_VERSION, true);
    wp_localize_script('forminator-paystack', 'FormPaystack', [
        'form_id'       => $settings['form_id'],
        'amount_field'  => $settings['amount_field'],
        'email_field'   => $settings['email_field'],
        'public_key'    => $settings['public_key'],
        'callback_url'  => $settings['callback_url'],
        'ajax_url'      => admin_url('admin-ajax.php'),
        'nonce'         => wp_create_nonce('forminator_paystack_nonce')
    ]);
});

// Register AJAX handlers for verification
add_action('wp_ajax_forminator_paystack_verify', 'handle_forminator_paystack_verify');
add_action('wp_ajax_nopriv_forminator_paystack_verify', 'handle_forminator_paystack_verify');

// Add new AJAX handler for initialization
add_action('wp_ajax_forminator_paystack_initialize', 'handle_forminator_paystack_initialize');
add_action('wp_ajax_nopriv_forminator_paystack_initialize', 'handle_forminator_paystack_initialize');

function handle_forminator_paystack_initialize() {
    if (!isset($_POST['nonce']) || !wp_verify_nonce($_POST['nonce'], 'forminator_paystack_nonce')) {
        wp_send_json_error(['message' => 'Invalid nonce']);
    }
    
    $email = sanitize_email($_POST['email']);
    $amount = floatval($_POST['amount']);
    $form_id = intval($_POST['form_id']);
    
    if (!$email || !is_email($email)) {
        wp_send_json_error(['message' => 'Invalid email address']);
    }
    
    if (!$amount || $amount <= 0) {
        wp_send_json_error(['message' => 'Invalid amount']);
    }
    
    $settings = forminator_paystack_get_settings();
    $secret_key = $settings['secret_key'];
    $callback_url = $settings['callback_url'];
    
    // Amount should be in kobo (multiply by 100)
    $amount_in_kobo = round($amount * 100);
    $reference = 'FORMINATOR-' . $form_id . '-' . time();
    
    $response = wp_remote_post('https://api.paystack.co/transaction/initialize', [
        'headers' => [
            'Authorization' => 'Bearer ' . $secret_key,
            'Content-Type' => 'application/json',
            'Cache-Control' => 'no-cache'
        ],
        'body' => json_encode([
            'email' => $email,
            'amount' => $amount_in_kobo,
            'reference' => $reference,
            'callback_url' => $callback_url
        ])
    ]);
    
    if (is_wp_error($response)) {
        wp_send_json_error(['message' => 'Connection error: ' . $response->get_error_message()]);
    }
    
    $body = json_decode(wp_remote_retrieve_body($response), true);
    
    if (isset($body['status']) && $body['status']) {
        wp_send_json_success($body['data']);
    } else {
        wp_send_json_error(['message' => $body['message'] ?? 'Payment initialization failed']);
    }
}

function handle_forminator_paystack_verify() {
    if (!isset($_POST['nonce']) || !wp_verify_nonce($_POST['nonce'], 'forminator_paystack_nonce')) {
        wp_send_json_error(['message' => 'Invalid nonce']);
    }

    $reference = sanitize_text_field($_POST['reference']);
    if (!$reference) {
        wp_send_json_error(['message' => 'Missing reference']);
    }

    $settings = forminator_paystack_get_settings();
    $paystack_secret = $settings['secret_key'];

    $response = wp_remote_get("https://api.paystack.co/transaction/verify/{$reference}", [
        'headers' => [
            'Authorization' => 'Bearer ' . $paystack_secret
        ]
    ]);

    if (is_wp_error($response)) {
        wp_send_json_error(['message' => 'Unable to verify payment']);
    }

    $body = json_decode(wp_remote_retrieve_body($response), true);
    if (isset($body['data']) && $body['data']['status'] === 'success') {
        wp_send_json_success(['message' => 'Payment verified successfully']);
    } else {
        wp_send_json_error(['message' => $body['message'] ?? 'Verification failed']);
    }
}

add_shortcode('forminator_paystack_button', function ($atts = []) {
    $settings = forminator_paystack_get_settings();
    $defaults = [
        'form_id' => $settings['form_id']
    ];
    $atts = shortcode_atts($defaults, $atts);
    $form_id = intval($atts['form_id']);
    return '<div style="margin-top: 20px;">
        <button type="button" id="forminator-paystack-button-' . $form_id . '" class="forminator-button forminator-button-submit">Pay Now</button>
        <div id="forminator-paystack-error-' . $form_id . '" style="color:red; display:none; margin-top:10px;"></div>
    </div>';
});

/**
 * Admin Settings Page
 */
// Add admin menu: always under Settings
add_action('admin_menu', function() {
    add_options_page(
        'Forminator Paystack Integration',  // Page title
        'Forminator Paystack',              // Menu title
        'manage_options',                   // Capability
        'forminator-paystack-settings',     // Menu slug
        'forminator_paystack_settings_page' // Callback function
    );
});

// Register settings
add_action('admin_init', function() {
    register_setting('forminator_paystack_settings', FORMINATOR_PAYSTACK_OPTION);
});

// Settings page callback
function forminator_paystack_settings_page() {
    $settings = forminator_paystack_get_settings();
    
    // Save settings
    if (isset($_POST['forminator_paystack_save_settings']) && check_admin_referer('forminator_paystack_settings_nonce')) {
        $new_settings = [
            'form_id'       => intval($_POST['form_id']),
            'amount_field'  => sanitize_text_field($_POST['amount_field']),
            'email_field'   => sanitize_text_field($_POST['email_field']),
            'public_key'    => sanitize_text_field($_POST['public_key']),
            'secret_key'    => sanitize_text_field($_POST['secret_key']),
            'callback_url'  => esc_url_raw($_POST['callback_url']),
            'test_mode'     => isset($_POST['test_mode']) ? 'yes' : 'no',
        ];
        
        update_option(FORMINATOR_PAYSTACK_OPTION, $new_settings);
        echo '<div class="notice notice-success"><p>Settings saved successfully!</p></div>';
        $settings = $new_settings;
    }
    
    // Display settings form
    ?>
    <div class="wrap">
        <h1>Forminator Paystack Integration Settings</h1>
        
        <form method="post" action="">
            <?php wp_nonce_field('forminator_paystack_settings_nonce'); ?>
            
            <table class="form-table">
                <tr>
                    <th scope="row"><label for="form_id">Forminator Form ID</label></th>
                    <td>
                        <input type="number" name="form_id" id="form_id" value="<?php echo esc_attr($settings['form_id']); ?>" class="regular-text">
                        <p class="description">The ID of your Forminator form.</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row"><label for="amount_field">Amount Field ID</label></th>
                    <td>
                        <input type="text" name="amount_field" id="amount_field" value="<?php echo esc_attr($settings['amount_field']); ?>" class="regular-text">
                        <p class="description">The field ID for the payment amount (e.g., calculation-1).</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row"><label for="email_field">Email Field ID</label></th>
                    <td>
                        <input type="text" name="email_field" id="email_field" value="<?php echo esc_attr($settings['email_field']); ?>" class="regular-text">
                        <p class="description">The field ID for the customer email (e.g., email-1).</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row"><label for="public_key">Paystack Public Key</label></th>
                    <td>
                        <input type="text" name="public_key" id="public_key" value="<?php echo esc_attr($settings['public_key']); ?>" class="regular-text">
                        <p class="description">Your Paystack public key.</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row"><label for="secret_key">Paystack Secret Key</label></th>
                    <td>
                        <input type="password" name="secret_key" id="secret_key" value="<?php echo esc_attr($settings['secret_key']); ?>" class="regular-text">
                        <p class="description">Your Paystack secret key.</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row"><label for="callback_url">Callback URL</label></th>
                    <td>
                        <input type="url" name="callback_url" id="callback_url" value="<?php echo esc_url($settings['callback_url']); ?>" class="regular-text">
                        <p class="description">The URL to redirect to after payment (e.g., your thank you page).</p>
                    </td>
                </tr>
                
                <tr>
                    <th scope="row">Test Mode</th>
                    <td>
                        <label for="test_mode">
                            <input type="checkbox" name="test_mode" id="test_mode" <?php checked($settings['test_mode'], 'yes'); ?>>
                            Enable test mode
                        </label>
                        <p class="description">Check this to use Paystack test keys instead of live keys.</p>
                    </td>
                </tr>
            </table>
            
            <h2>Shortcode Usage</h2>
            <p>Use this shortcode to display the payment button after your Forminator form:</p>
            <code>[forminator_paystack_button]</code>
            <p>Or specify a different form ID:</p>
            <code>[forminator_paystack_button form_id="1234"]</code>
            
            <p class="submit">
                <input type="submit" name="forminator_paystack_save_settings" class="button-primary" value="Save Settings">
            </p>
        </form>
    </div>
    <?php
}