Body for PUT /tokenwise/settings/configs/{config_id} — partial update.
An explicit overrides: null is "leave unchanged"; {} clears them. The gateway enforces the same semantics; we forward the JSON verbatim.
Successful Response
Response shape for config GET / POST / PUT.
A unique ID for the request (not the message). Repeated identical requests get different IDs. However, for a streaming response, the ID will be the same for all responses in the stream.