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Errors use RFC 9457 problem details (application/problem+json) with a stable code. Branch on code, never on title or detail. Many errors include a hint with the fix. Errors never cost anything. Most carry X-Credits-Charged: 0 and an X-Problem-Code header. Most 429 and 503 responses also include Retry-After in seconds, and retry_after_s in the body.
Quote the request_id when you contact support.