Generate x renewal orders for an existing subscription.

subscriptions-script-generate-renewal-orders-for-subscription.php

<?php
/**
 * This script can be used to quickly add a stack of renewals
 * to an existing subscription. Can be useful when testing
 * scalability concerns for WooCommerce Subscriptions.
 */

function generate_renewal_order_for_subscription( $subscription_id ) {
	$subscription = new WC_Subscription( $subscription_id );

	// We can't successfully trigger creation of a renewal unless the subscription
	// is active, which may not initially be the case.
	if ( 'active' !== $subscription->get_status() ) {
		$subscription->update_status( 'active' );
	}

	// Try triggering a renewal. This also often sets the subscription to on-hold,
	// so we again change the status.
	WC_Subscriptions_Manager::prepare_renewal( $subscription_id );
	$subscription->update_status( 'active' );
}

// Generate 100 renewals for the subscription (adjust the sub ID as needed).
for ( $i = 1; $i <= 100; $i++ ) {
	generate_renewal_order_for_subscription( 1234 );
	print '.' . ( ( $i % 10 ) ? '' : PHP_EOL ); // Progress dots intended for CLI usage.
}