Stop fluent support user from opening a ticket via email piping if the user not exist in fluent crm

StopUserFromTicketCreate.php

<?php
add_action('fluent_support/before_ticket_create_from_email', function($responseOrTicketData, $customer){
	if (function_exists('FluentCrmApi')){
		$contactApi = FluentCrmApi('contacts');
		$contact = $contactApi->getContact($customer->email);
		if (!$contact) {
			exit;
		}
	}
}, 10, 2);