Immediately send `subscription.updated` webhooks for pending subscriptions

wcs-force-webhook.php

<?php
/**
 * Plugin Name: WCS immediately send subscription.updated webhook
 * Plugin URI: 
 * Description: Force immediate webhook delivery for subscription.updated webhooks on pending subscriptions
 * Version: 1.0
 * Author: Matt Allan - Prospress Inc.
 * Author URI: http://prospress.com
 */

/**
 * Force immediate webhook delivery if a pending subscription is updated
 *
 * @param bool $scheduled_delivery
 * @param WC_Webhook $webhook
 * @param mixed $subscription
 * @return bool
 */
function wcs_maybe_force_webhook_delivery( $schedule_delivery, $webhook, $subscription = null ) {

	if ( $schedule_delivery && ! empty( $subscription ) && wcs_is_subscription( $subscription ) ) {

		if ( ! is_object( $webhook ) ) {
			$webhook = new WC_Webhook( $webhook );
		}
		$topic = $webhook->get_topic();

		if ( ! is_object( $subscription ) ) {
			$subscription = wcs_get_subscription( $subscription );
		}

		if ( $subscription->has_status( 'pending' ) && 'subscription.updated' == $topic ) {
			$schedule_delivery = false; // send webhook immediately
		}
	}
	return $schedule_delivery;
}
add_filter( 'woocommerce_webhook_deliver_async', 'wcs_maybe_force_webhook_delivery', 10, 3 );