The ZDHC AID is a unique account identification that gets assigned to each organisation that joins the ZDHC Gateway. Once you are registered, you can find the AID that was assigned to your organisation in the organistation profile.

The ZDHC AID is particularly important for suppliers as they need to indicate their AID when they sign in for the ZDHC Supplier Platform. 

The ZDHC UID is the unique user identification that gets assigned to each user on the ZDHC Gateway. You can find the UIDs of all user of the account of your organisation in the organisation profile under USERS.