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Errors use problem details (RFC 9457) with Content-Type: application/problem+json:
Decide what to do from status and code. detail is text for people and changes with the language of the request. Quote traceId when you contact support. Some problems carry extra members: A resource that belongs to another store answers exactly like one that does not exist.

Codes

Retry 429 after Retry-After, and 5xx with backoff. Other 4xx codes will fail the same way until the request changes.