Identifier of the resource in Payrails.

Optional. The ID of the network token provider config to use for cryptogram generation. When provided, the request validates the config with the same rules as network token provision. When omitted, the workflow resolves the provider config from the instrument token path or, for legacy tokens without metadata, falls back to the active provider config only when it is unambiguous.

Idempotency key to be used. Sending again the same key would return the same result without re-executing the update.