The terminal, now PENDING_VALIDATION.

The request has no valid access token. Get a new token from POST /login and send it as Authorization: Bearer <token>.

Codes: UNAUTHORIZED_NO_TOKEN (no Authorization header), UNAUTHORIZED_INVALID_TOKEN (expired or malformed token),
UNAUTHORIZED_NO_CONTEXT (the token does not belong to a payor or merchant), UNAUTHORIZED_NO_PAYOR (the token gives access
to more than one payor and the request did not send x-payor-id). A few endpoints answer from the API gateway instead and
return only {"message": "Unauthorized"}.

The token is valid but is not allowed to perform this operation.

Codes: FORBIDDEN_INSUFFICIENT_TAGS (your credential's role does not allow this operation), FORBIDDEN_CONDITION_NOT_MET
(the payment amount is above your approval limit). Some endpoints add their own codes; they are listed in the endpoint
description.

The resource does not exist in your account.

The request is valid but conflicts with the current state of the resource. Read code and the endpoint description to
decide what to do.