Many apps can be developed for and used with Shift4Shop's REST API functionality. The REST API is commonly used by third-party applications to connect to your store and offer functionality with their product or service. These third-party apps will typically provide you with the details to enable their app, including their App API Key.
The REST API should be enabled by default with your Shift4Shop account. To confirm if it is available for your store, please login into your Shift4Shop Online Store Manager and use the left navigation menu to:
Go to Modules.
Once there, use the search bar at the top to search for "REST API.”
Once completed, you will see the REST API icon and a link labeled “Change Settings,” which will allow you to manage and add your REST API Connected apps.
For complete documentation on the REST API, visit http://apirest.3dcart.com/.