Marcar los pedidos como pagados vía parámentros en la URL si falla el código del plugon

escuchar-parametros-url.php

<?php

add_action( 'wp_head', 'redsys_force_mark_order_as_paid_on_thankyou_page_2' );

/**
 * Force mark order as paid on thank you page.
 *
 * @return void
 */
function redsys_force_mark_order_as_paid_on_thankyou_page_2() {

	if ( isset( $_GET['key'], $_GET['Ds_MerchantParameters'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$order_key = sanitize_text_field( wp_unslash( $_GET['key'] ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$order_id  = wc_get_order_id_by_order_key( $order_key );

		if ( $order_id && is_numeric( $order_id ) ) {
			sleep( 5 );

			$is_redsys_order = WCRed()->is_redsys_order( $order_id );
			$is_paid         = WCRed()->is_paid( $order_id );
			$order           = wc_get_order( $order_id );

			if ( ( $order && $is_redsys_order && ! $is_paid ) || WCRed()->is_payment_method_change_order( $order_id ) ) {
				// Check the Redsys URL.
				if ( isset( $_GET['Ds_MerchantParameters'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
					$params          = array(
						'Ds_MerchantParameters' => sanitize_text_field( wp_unslash( $_GET['Ds_MerchantParameters'] ) ), // phpcs:ignore WordPress.Security.NonceVerification.Recommended
						'Ds_Signature'          => isset( $_GET['Ds_Signature'] ) ? sanitize_text_field( wp_unslash( $_GET['Ds_Signature'] ) ) : '', // phpcs:ignore WordPress.Security.NonceVerification.Recommended
					);
					$payment_method  = $order->get_payment_method();
					$payment_gateway = WC_Payment_Gateways::instance()->payment_gateways()[ $payment_method ];
					if ( $payment_gateway && method_exists( $payment_gateway, 'successful_request' ) ) {
						$payment_gateway->successful_request( $params );
					}
				}
			}
		}
	}
}

You can use this code if you’re using my WooCommerce Redsys Gateway plugin by placing it in your theme’s functions.php file or in a snippets plugin like Code Snippets.