Redirect PMPro related webhooks to PMPro webhook handler.

my_woocommerce_api_request_redirect_pmpro.php

<?php

/**
 * Redirect PMPro related webhooks to PMPro webhook handler.
 */
function my_woocommerce_api_request_redirect_pmpro( $request ) {

	global $wpdb;

	// Only continue if PMPro is loaded.
	if ( ! defined( 'PMPRO_DIR' ) ) {
		return true;
	}

	// Load Stripe library if necessary.
	if(!class_exists("Stripe\Stripe")) {
		require_once( PMPRO_DIR . "/includes/lib/Stripe/init.php" );
	}

	try {
		Stripe\Stripe::setApiKey( pmpro_getOption( "stripe_secretkey" ) );
	} catch ( Exception $e ) {
		pmpro_stripeWebhookExit();
	}

	// retrieve the request's body and parse it as JSON
	if(empty($_REQUEST['event_id']))
	{
		$body = @file_get_contents('php://input');
		$post_event = json_decode($body);

		//get the id
		if(!empty($post_event))
			$event_id = sanitize_text_field($post_event->id);
	}
	else
	{
		$event_id = sanitize_text_field($_REQUEST['event_id']);
	}

	//get the event through the API now
	if(!empty($event_id))
	{
		try
		{
			global $pmpro_stripe_event;
			$pmpro_stripe_event = Stripe\Event::retrieve($event_id);
		}
		catch(Exception $e)
		{
			// pmpro_stripeWebhookExit();
			$pmpro_stripe_event = $post_event;			//for testing you may want to assume that the passed in event is legit
		}
	}

	// Check for a PMPro related Customer
	if ( ! empty( $pmpro_stripe_event->data->object->customer ) ) {
		$sql = "SELECT umeta_id FROM {$wpdb->usermeta} WHERE meta_key = 'pmpro_stripe_customerid' AND meta_value = '{$pmpro_stripe_event->data->object->customer}'";
		$pmpro_customer_id = $wpdb->get_var( $sql );
	}

	// If there is a related order in PMPro, load the PMPro webhook handler and exit.
	if ( ! empty( $pmpro_customer_id ) ) {
		require_once( PMPRO_DIR . '/services/stripe-webhook.php' );
		exit();
	}

}
add_action( 'woocommerce_api_request', 'my_woocommerce_api_request_redirect_pmpro', 1, 1 );