Set User - Identifier
An alias is a unique, user-specific identifier, set by the application owner (for example, the user's email or an internal system ID number) and is limited to 254 characters.
Aliases have the following uses:
The app owner and <DMC> both use the same alias to identify the user.
All devices owned by a specific user (an iPhone, an iPad, an Android device, etc.) are identified by the same alias.
Aliases are used to create segments of application users, based on user-specific properties (as opposed to application-specific properties).
Note the difference between aliases and tags:
Aliases are user-specific, and each user can only have one alias (shared by all the user's devices).Â
Tags are app-specific, and you can assign multiple tags to the same device.
The alias API will create an association between a user and a device