One way to get started or refine requests is to use the BigCommerce App Extensions Postman collection, which contains the core mutations and queries. To work with the Postman collection, you need to supply the following:
store_hash.access_token is available in your app’s database as soon as you successfully install the app. You can also add a console log to get it from the terminal after the app completes the auth callback.The following code block is an exported Postman collection of App Extensions mutations and queries. To copy the collection, hover over the upper right corner of the code block.
For instructions on importing collections into Postman, see their article on Importing and Exporting Data (Postman).