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  1. Frequently asked questions
  2. Verification Of Payee scheme
  3. API Specifications

VerificationOfPayeeError, the yaml defines two fields as mandatory: code and type. Specifically, code (MessageCode) should be equal to one of the following ISO codes: [FORMAT_ERROR, CLIENT_INVALID, CLIENT_INCONSISTENT, TIMESTAMP_INVALID] but the examples listed in the API specifications leave that field blank in the following cases: ‘Certificate Items’ and ‘Internal Server Error’. Please could you advise which value might be used in that case?

EPC FAQ:  —  Last updated: 28/08/2025

In these cases, the response code is sufficient and self-explanatory, there is no need for a detailed error code.  

Only in certain cases can additional error information be added.