This script is not a standalone payment module, its a module that requires Perfex CRM application installed. This module is created for Perfex CRM and it enables you to receive payments via your Shopier from Perfex CRM’s invoices. Installation: Upload zip file under the modules page of the Perfex CRM; Activate the module; Go to Settings > Payment Gateways > Shopier; Enter your API key and secret that you can receive from your shopier account.