mypmpro-redirect-to-invoice-after-checkout.php

<?php //do not copy

/* This recipe will redirect a member after checkout to their invoice
 *
 * 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/
 */

function my_pmpro_confirmation_url($url, $user_id, $level){

	//Get the order
	$order = new MemberOrder();
	$order->getLastMemberOrder( $user_id );

	//Order number
	$member_order = $order->code;

	//Build URL
	$url = home_url("/membership-account/membership-invoice/?invoice=".$member_order );

	return $url;
}
add_filter( 'pmpro_confirmation_url', 'my_pmpro_confirmation_url', 10, 3 );