Retrieves a list of user grants.
Unique User identifier
OK
{"results": [{"grantId": "0123456789ABCD","entitlement_type": "bundle","entitlement_id": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX","startTime": "2022-06-01 00:00:00","endTime": "2022-12-31 23:59:59","product_id": "XXXXXXXXXXXXXX"}]}