The Woosage50 Service, running on your PC or server, uses a custom REST API that is incorporated into the Woosage50 Plugin.  It has been designed to be more efficient in processing orders and product updates than the WooCommerce API, that was used in previous version of Woosage.  The API requires a key and secret that is associated with the website URL and is held in an encrypted config file for use by the Woosage50 Service.