The MUX unified registration service is a service that AOC makes available to Catalan public administrations that allows the integration of AOC services with each organization's own general entry and exit register.

With this integration, the entries of entry or exit entries generated by the AOC services are made directly in the general register of the organization instead of being made in the auxiliary electronic register of the EACAT. Rules can be defined that allow entries to be made in different registers depending on the request parameters that are established.