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The current version is 2026-11-01. Webhook payloads carry it as api_version. These changes can happen at any time, and your code should tolerate them:
  • new endpoints;
  • new optional request parameters;
  • new fields in responses and webhook payloads;
  • new values in enums such as reason.code, query item code and error code;
  • new event types.
Anything else (removing or renaming a field, changing a type or a status) ships as a new dated version, announced in the changelog in advance.