Simulate PayPal renewal IPN for WooCommerce Subscriptions

functions.php

add_action( 'woocommerce_order_actions', 'add_simulate_renewal_subscription_action' );

function add_simulate_renewal_subscription_action( $actions ) {

    global $theorder;

    // Make sure we're in a subscription typeof order
    if ( wcs_is_subscription( $theorder ) && ! $theorder->has_status( wcs_get_subscription_ended_statuses() ) ) {
        
        // New action
        $actions['wcs_simulate_renewal'] = esc_html__( 'Simulate Renewal IPN', 'woocommerce-subscriptions' );
    }

    return $actions;
}

add_action( 'woocommerce_order_action_wcs_simulate_renewal', 'simulate_renewal_ipn_for_subscription' );
 
function simulate_renewal_ipn_for_subscription( $subscription ) {
	
	if ( wcs_is_subscription ( $subscription ) ) {
		$subscription->update_status( 'on-hold' );
		
		$renewal_order      = wcs_create_renewal_order( $order );
		$available_gateways = WC()->payment_gateways->get_available_payment_gateways();

		$renewal_order->set_payment_method( $available_gateways['paypal'] );
		
		$this->add_order_note( __( 'This is a fake renewal called from the subscription page. Marking payment complete.', 'woocommerce-subscriptions' ), $subscription, $transaction_details );
		
		$renewal_order->payment_complete( 'MADEUPTRANSACTIONID' );

	}
}