# User Management
source: https://developer.mastercard.com/pclo-presentment/documentation/use-cases/user-management/index.md

The following use cases refer to users as cardholders and an account as a unique card.

## Enroll User {#enroll-user}

This use case enables enrollment for an initial user and account record into a rewards program. This operation is intended solely for new cardholders enrolling with their first account.

Refer to the [Enroll User](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/user-management/#enroll-user) use case within User Management.

## Update User {#update-user}

This use case applies when a user wants to update personal information for current cardholders, including their name, contact information, and security question.

Refer to the [Update User](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/user-management/#update-user) use case within User Management.

## Retrieve User {#retrieve-user}

This use case applies when a user wants to retrieve a cardholder's information, including their name, address, verification questions, and communication preferences.

Refer to the [Retrieve User](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/user-management/#retrieve-user) use case within User Management.

## Verify User {#verify-user}

This use case applies when a user wants to verify the information based on the security questions and answers sent in the request.

Refer to the [Verify User](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/user-management/#verify-user) use case within User Management.

## Lost or Stolen Card {#lost-or-stolen-card}

This use case applies when a cardholder needs to replace a card that was lost or stolen with a new card.

Refer to the [Lost Stolen Card](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/lost-stolen-card/) use case for details.

## Lookup Identifiers {#lookup-identifiers}

This use case outlines the process to retrieve tokens and sensitive identifiers necessary for completing specific functions.

Refer to the [Lookup Identifiers](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/lookup-identifiers/) use case for details.