Response codes of the Collaborating Entity EECC or Financial Entity EEFF
When making a request to debit an account through the AEAT payment gateway, the financial institution may reject the operation due to different circumstances (technical problems, errors in the data provided, incorrect identification, duplicate payment, etc.) and return the corresponding error messages.
These are responses generated by financial entities ( EEFF ) or collaborators ( EECC ) and it is necessary to carry out the necessary checks and contact these entities to solve the problem.
Alternatively, you can request the NRC directly from the bank, providing the payment details, use the electronic banking services they offer or process the charge in another account or in a different financial institution.