User attributes are specific traits of a user, like an email, username, mobile, gender, etc.
This is crucial and helps in targeting users based on these attributes across devices or installs.

Implementing Login / Logout Mechanism for a User

Setting Unique ID in order to Login User :

• It's important to set the unique identifier when a user logs into your app. This is to unify the new user with an existing user, if any exists, and will help prevent creating unnecessary/stale users.
• Setting the Unique ID is a critical piece to tie a user across devices and installs/uninstalls as well across all platforms (i.e. iOS, Android, Windows, The Web). Set the attribute as soon as the user is logged in. A unique Identifier can be something like an email ID, a username (unique), or a database ID or any Backend generated identifier which can be used to uniquely identify the user.
• Do not set this for the user who is not logged in.

using MoEngage;

MoEngageClient.SetUniqueId();

Notifying the SDK when the user logs out of the app

using MoEngage;

MoEngageClient.Logout();

Updating Unique Identifier

In a scenario where you have to update the Unique Identifier value for an already logged-in user use SetAlias()

using MoEngage;

MoEngageClient.SetAlias();

Tracking User Attributes

To track user attributes line First Name, Last Name, email, phone number, etc use the below APIs

using MoEngage;

MoEngageClient.SetFirstName();
MoEngageClient.SetLastName();
MoEngageClient.SetEmail();
MoEngageClient.SetUniqueId();
MoEngageClient.SetPhoneNumber();
MoEngageClient.SetGender();

For setting other User Attributes you can use generic method SetUserAttribute(key,value)

using MoEngage;

MoEngageClient.SetUserAttribute();

Tracking Date as user attributes

To track any date as user attributes use the MoEngageClient.SetUserAttributeISODate(). This API takes attribute name and ISO Date as input.
Date Format - yyyy-MM-dd'T'HH:mm:ss.fff'Z'
Example:

using MoEngage;

MoEngageClient.SetUserAttributeISODate("userAttrDate", "2019-01-02T08:26:21.170Z");