400. Malformed body, a field that failed local validation, a missing
X-Idempotency-Key header, an unknown field, a rejected field combination, or an invalid
enum value. Codes include INVALID_PAYLOAD, INVALID_REQUEST, INVALID_PARAMETER,
MALFORMED_REQUEST and INVALID_OPERATION_TYPE. INVALID_PAYLOAD carries a details
array of { field, code, message }, one entry per failing field.

404. The resource is unknown or belongs to another marketplace; the response is identical
in both cases. Codes include ONBOARDING_NOT_FOUND, PROFILE_NOT_FOUND,
ACCOUNT_NOT_FOUND, TRANSFER_NOT_FOUND and TRANSFER_ACCOUNT_NOT_OWNED.

409. The idempotency key was reused with a different payload, or the resource is locked
by a concurrent operation. Codes include IDEMPOTENCY_PAYLOAD_MISMATCH and
RESOURCE_BUSY.

422. The resource is in a state that does not allow the operation, or a submitted
document is invalid. Codes include
INVALID_STATE, INVALID_FIELD_FOR_PROFILE_TYPE,
INVALID_DOCUMENT, INVALID_ONBOARDING_DATA, DOCUMENT_ALREADY_REGISTERED,
MISSING_REQUIRED_DOCUMENTS, ONBOARDING_ALREADY_PROCESSING,
TRANSFER_DESTINATION_MISMATCH,
TRANSFER_ACCOUNT_NOT_VALIDATED.