Removes a user's membership order data either by manually adding in a query param, or when deleting a user through /wp-admin/

pmpro-remove-user-membership-order-data.php

<?php
/**
 * Remove user order manually by adjusting the ID's in the array, or adding them into a 
 * query param by setting it to /?reset_test_accounts=true&accounts=2,3
 */
function pmpro_remove_orders( $user_id = null ){

	if( isset( $_REQUEST['reset_test_accounts'] ) && $_REQUEST['reset_test_accounts'] == 'true' ){
		
		global $wpdb;
		// Change this according to the user's you'd like to remove
		$user_ids = array( 2, 3 ); 

		// Or set it in the URL /?reset_test_accounts=true&accounts=2,3
		if( isset( $_REQUEST['accounts'] ) )
			$user_str = $_REQUEST['accounts'];
			$user_ids = explode( ",",  $user_str );

		if( is_array( $user_ids ) ){
			foreach( $user_ids as $uid ){
				//Deleting the member order
				$wpdb->delete( $wpdb->pmpro_membership_orders, array( 'user_id' => intval( $uid ) ) );
			}
		}
		//Results are cached - this will force a new query to be run with the updated results
		delete_transient( 'pmpro_report_memberships_signups' );
		delete_transient( 'pmpro_report_memberships_cancellations' );
	}

}
add_action( 'init', 'pmpro_remove_orders' );