> ## Documentation Index
> Fetch the complete documentation index at: https://docs.m1amdocs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication Identifiers

Email addresses and mobile numbers are the primary types of authentication identifier (or authN ID) in Storefront Gateway. As a Care Representative, you can assist your organization's end users with their email address and mobile number management.

You can perform the following tasks upon a user's request:

* [Add an Email Address](addingNewEmail)

* [Update an Email Address](sgUpdatingEmail)

* [Remove an Email Address](removingEmail)

* [Add a Mobile Number](addingNewMobileNumber)

* [Update a Mobile Number](updatingMobileNumber)

* [Remove a Mobile Number](removingMobileNumber)

* [Resend a Verification Message](sgVerificationMessage)

* [Generate a backup code](sgCareBackupCodes)

* **[Add an Email Address](addingNewEmail)**

* **[Update an Email Address](sgUpdatingEmail)**

* **[Remove an Email Address](removingEmail)**

* **[Add a Mobile Number](addingNewMobileNumber)**

* **[Update a Mobile Number](updatingMobileNumber)**

* **[Remove a Mobile Number](removingMobileNumber)**

* **[Verification Message](sgVerificationMessage)**

* **[Backup Codes](sgCareBackupCodes)**

**Parent topic:**[Update a User's Details](sgUpdatingProfile)


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