Disables the `pmpro_send_200_http_response()` function.

filter_pmpro_send_200_http_response.php

<?php

// Copy from below here...

/**
 * Disables the `pmpro_send_200_http_response()` function.
 *
 * That function was implemented in PMPro v2.6.4 to allow IPN/webhook
 * handlers to adknowledge the receipt of a webhook before processing
 * it in order to avoid timeout issues at the gateway.
 *
 * This code recipe should be used in cases where gateways are showing that
 * PMPro returned an error for a webhook, even though the webhook was processed properly.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
add_filter( 'pmpro_send_200_http_response', '__return_false' );