laybuy-gateway-for-woocommerce/includes/constants.php

<?php
if( !defined( 'ABSPATH' ) ) exit;

define( 'WC_GATEWAY_LAYBUY_ID', 'wc-laybuy');
define( 'WC_LAYBUY_WOOCOMMERCE_LAYBUY_PLUGIN_PATH', plugin_dir_url(__FILE__));