Before you can use the User Sync endpoints, you must do the following things.
Contact AppDirect Support to enable User Sync for a product. Once enabled, the developer receives a subscription ID for their product. The subscription ID uniquely identifies the product in marketplace requests.
To authenticate through the API, you need authentication credentials . To obtain credentials go to Manage > Billing and Distribution > Products > product name | Edit > Credentials. See Authorize inbound API requests (for separate credentials) or Authorize inbound API requests (legacy) (for shared credentials) for information on how to securely access product API requests.
Note: The authentication credentials are for a product. Developer accounts are not associated with any particular product.