Delete all sandbox orders and sandbox subscriptions.

my_pmpro_delete_sandbox_data.php

<?php
/**
 * Delete all sandbox orders and sandbox subscriptions.
 * WARNING: This permanently deletes data. Back up your database first!
 * 
 * Does not cancel anything at the gateway. 
 * If necessary, delete Sandbox subscriptions via gateway dashboard.
 *
 * Run it ONCE: visit /wp-admin/?pmpro_delete_sandbox_data=1 as an admin,
 * then remove this snippet.
 * 
 * You can add this snippet 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_delete_sandbox_data() {
	if ( empty( $_REQUEST['pmpro_delete_sandbox_data'] ) || ! current_user_can( 'manage_options' ) ) {
		return;
	}

	global $wpdb;

	// Orders.
	$order_ids = $wpdb->get_col( "SELECT id FROM $wpdb->pmpro_membership_orders WHERE gateway_environment = 'sandbox'" );
	if ( ! empty( $order_ids ) ) {
		$ids = implode( ',', array_map( 'intval', $order_ids ) );
		$wpdb->query( "DELETE FROM $wpdb->pmpro_membership_ordermeta WHERE pmpro_membership_order_id IN ($ids)" );
		$wpdb->query( "DELETE FROM $wpdb->pmpro_membership_orders WHERE id IN ($ids)" );
	}

	// Subscriptions.
	$sub_ids = $wpdb->get_col( "SELECT id FROM $wpdb->pmpro_subscriptions WHERE gateway_environment = 'sandbox'" );
	if ( ! empty( $sub_ids ) ) {
		$ids = implode( ',', array_map( 'intval', $sub_ids ) );
		$wpdb->query( "DELETE FROM $wpdb->pmpro_subscriptionmeta WHERE pmpro_subscription_id IN ($ids)" );
		$wpdb->query( "DELETE FROM $wpdb->pmpro_subscriptions WHERE id IN ($ids)" );
	}

	wp_die(
		sprintf(
			'Deleted %d sandbox orders and %d sandbox subscriptions. Remove this snippet now.',
			count( $order_ids ),
			count( $sub_ids )
		)
	);
}
add_action( 'admin_init', 'my_pmpro_delete_sandbox_data' );