MemberPress user cleanup when transaction fails

mp-delete-user-transaction-failed.php

<?php

add_action( 'mepr-txn-status-failed', 'my_custom_cleanup_memberpress_txn_failed', 15 );
/**
 * Runs a "cleanup" when a MemberPress transaction fails.
 * This checks the transaction's user to see if they have any completed transactions.
 * If the user only has incomplete transactions, it deletes the user.
 *
 * @param object 	$txn 	MeprTransaction object
 *
 * @return void
 */
function my_custom_cleanup_memberpress_txn_failed( $txn ) {
	
	// User from the transaction
	$mp_user = $txn->user();

	// Count complete transactions and non-complete transactions
	$user_incomplete_txns = $mp_user->transactions( '`status` != "complete"' );
	$user_complete_txns = $mp_user->transactions( '`status` = "complete"' );

	// User only has non-complete transactions, so delete the user
	if ( empty( $user_complete_txns ) && ! empty( $user_incomplete_txns ) ) {
		$mp_user->destroy();
	}
}