# Use Cases
source: https://developer.mastercard.com/user-account-management-service/documentation/use-cases/index.md

Navigate through the use cases to better understand the functionality behind the User Account Management APIs:

* [User Management](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/user-management/index.md)
* [Account Management](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/account-management/index.md)
* [CLS Offer Activations](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/cls-offer-activation/index.md)
* [Lost Stolen Card](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/lost-stolen-card/index.md)
* [PAN Block](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/pan-block/index.md)
* [Lookup Identifiers](https://developer.mastercard.com/user-account-management-service/documentation/use-cases/lookup-identifiers/index.md)

## Payload Encryption {#payload-encryption}

Some endpoints in the User Account Management API require payload encryption to ensure secure data transmission. Read the [Payload Encryption](https://developer.mastercard.com/platform/documentation/security-and-authentication/securing-sensitive-data-using-payload-encryption/) guide to understand the encryption process.

The API uses [JWE Encryption](https://developer.mastercard.com/platform/documentation/security-and-authentication/securing-sensitive-data-using-payload-encryption/#jwe-encryption) to encrypt the payload. For detailed instructions on how to encrypt a request object, refer to the [Integration and Testing](https://developer.mastercard.com/user-account-management-service/documentation/tutorials-and-guides/api-testing-tutorial/index.md) tutorial.

## Next Steps {#next-steps}

* Review endpoint request and response details in the [API Reference](https://developer.mastercard.com/user-account-management-service/documentation/api-reference/index.md).
* Test each use case with the positive and negative scenarios on the [Testing](https://developer.mastercard.com/user-account-management-service/documentation/testing/index.md) page.
* Resolve errors returned by these endpoints using [Code and Formats](https://developer.mastercard.com/user-account-management-service/documentation/code-and-formats/index.md).