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New error response contract

Standardized error responses

Abstract changelog cover for New error response contract
Abstract changelog cover for New error response contract

Every error now returns the same envelope with a machine-readable code field, a requestId for support requests, and field-level details in validationErrors on validation failures. Handle errors by code and not by message. See the full catalog in Errors.

A

{
"requestId": "9f6f9741-4c65-4e0b-a48f-16d5b34d9e2f",
"timestamp": "2026-08-10T10:30:45.123Z",
"path": "/transactions/on-ramp",
"status": 403,
"code": "KYC_NOT_APPROVED",
"message": "KYC/B is not approved for this customer"
}

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