# Users

A `User` resource represents a pair of API keys which are used to perform authenticated requests against the Finix API. When making authenticated requests via HTTP basic access authentication the ID of a `User` resource maps to the username, while the `password` corresponds to the password (i.e. secret key).

The password field for a `User` resource is only returned during the initial creation. Any following GET requests to the resource returns the `password` field as **null** for security purposes.

**Related Guides:**
- [Account Structure](/additional-resources/developers/resources-and-payment-flows/key-resources#account-structure)


## List Users

 - [GET /users](https://docs.finix.com/api/users/listusers.md): Retrieve a list of User resources.

## Fetch a User by ID

 - [GET /users/{user_id}](https://docs.finix.com/api/users/getuser.md): Retrieve the details of an existing User.

## Update a User

 - [PUT /users/{user_id}](https://docs.finix.com/api/users/updateuser.md): Update a User with new tags or disable the User and their credentials.