Check if license already created and if so then don’ t create new one

Hi,

Firstly I want to thank you for the great and really helpful work you have created. So far I love everything about the functionality and API of this plugin.

So I would like to know if there is a function that can check if a license containing a given Transaction ID (txn_id) is already created and if it has been created then don’t create a new license.

I am using this in order to create a license:

//Licence Generation process starts
$api_params = array(
	'slm_action' => 'slm_create_new',
	'secret_key' => '363h_ey91ndhy473g2vbd.hh2bv4h',
	'first_name' => $order_billing_first_name,
	'last_name' => $order_billing_last_name,
	'email' => $order_billing_email,
	'txn_id' => $order_id,
	'product_ref' => $product_name,
	'max_allowed_domains' => $max_allowed_domains,
	'date_created' =>date("Y-m-d"),
	'date_expiry' =>date('Y-m-d', strtotime('+1 year')),
);

// Send query to the license manager server
$response = wp_remote_get(add_query_arg($api_params, WCLCFC_LICENSE_SERVER_URL), array('timeout' => 20, 'sslverify' => false));

So is there a way how I could prior creating a license check if it already has been created by a given ‘txn_id’?

Kind regards