Many organizations already manage employee access cards in a physical access control system and want the same card values available in Eptura Engage, so users can use their building badge on desk and room screens without registering it manually.

Today this cannot be automated. The AdministrationAPI lets integrations create and update users (UsersManageUsersV1) and read them (UsersGetUsersV1, UsersGetAllUsersV1), but the user model has no RFID / card field. The only card-related field in the API, "userSerial", is used as a user identifier on booking operations; no operation sets, reads or removes the card assigned to a user. As a result, card changes require either self-registration by each user or a manual bulk import done by Eptura.

Request:
1. Add RFID / card value field(s) to the user model in UsersManageUsersV1 (decimal and/or hex, ideally multiple cards per user).
2. Return the card value(s) in UsersGetUsersV1 / UsersGetAllUsersV1.
3. Allow removing a card from a user (leavers, lost or reissued cards).

This would let customers keep badge data in sync with their access control or HR systems automatically, for new joiners, card replacements and leavers.