Trust Payments + FunnelKit Checkout Compatibility Snippet

Trust-payments-fk-checkout-compatibility

<?php
/**
 * Trust Payments + FunnelKit Checkout Compatibility Snippet
 *
 * Fixes two issues when using Trust Payments gateway with FunnelKit Checkout:
 * 1. "Form with id: 'st-form' does not exist" - SDK expects st-form but FunnelKit uses wfacp_checkout_form
 * 2. "Invalid card details" validation error - tp_valid_card_detail hidden field missing from form
 *
 * Usage: Add this code to your theme's functions.php or a custom plugin.
 *
 * @since 1.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

add_action( 'plugins_loaded', function() {
	// Only load if both plugins are active
	if ( ! class_exists( 'WFACP_Core' ) || ! defined( 'SECURETRADING_VERSION' ) ) {
		return;
	}

	/**
	 * Override SecureTrading SDK formId to use FunnelKit's form ID
	 */
	add_action( 'wp_head', function() {
		if ( ! function_exists( 'is_checkout' ) || ! is_checkout() ) {
			return;
		}
		?>
		<script>
		(function() {
			var checkInterval = setInterval(function() {
				if (typeof window.SecureTrading !== 'undefined') {
					clearInterval(checkInterval);
					var originalSecureTrading = window.SecureTrading;
					window.SecureTrading = function(config) {
						if (config && config.formId === 'st-form' && document.getElementById('wfacp_checkout_form')) {
							config.formId = 'wfacp_checkout_form';
						}
						return originalSecureTrading.call(this, config);
					};
					window.SecureTrading.prototype = originalSecureTrading.prototype;
				}
			}, 10);
			setTimeout(function() { clearInterval(checkInterval); }, 10000);
		})();
		</script>
		<?php
	}, 1 );

	/**
	 * Add tp_valid_card_detail hidden field inside FunnelKit checkout form
	 * Trust Payments uses woocommerce_checkout_after_order_review which FunnelKit doesn't fire
	 */
	add_action( 'wfacp_checkout_after_order_review', function() {
		static $added = false;
		if ( $added ) {
			return;
		}
		$added = true;
		?>
		<input type="hidden" id="tp_valid_card_detail" name="tp_valid_card_detail" value="" />
		<?php
	} );

}, 20 );