# Configure Custom User Data

**PATCH /groups/{groupId}/apps/{appId}/custom_user_data**

Modify the [Custom User
Data](https://www.mongodb.com/ko-kr/docs/atlas/app-services/users/enable-custom-user-data/)
configuration for an Atlas App Services App.


## Servers
- The root API resource and starting point for the App Services API.: https://services.cloud.mongodb.com/api/admin/v3.0 (The root API resource and starting point for the App Services API.)


## Authentication methods
- Token auth


## Parameters

#### Path parameters
- **groupId** (string)
  An Atlas [Project/Group
ID](https://docs.atlas.mongodb.com/tutorial/manage-projects/).
- **appId** (string)
  The ObjectID of your application.
[The App Services API Project and Application IDs section](#section/Project-and-Application-IDs) demonstrates how to find this
value.


## Body parameters
Content-type: application/json

- **database_name** (string)
  The name of the database that contains custom user data.
- **collection_name** (string)
  The name of the collection that contains custom user data.
- **user_id_field** (string)
  The name of a field that appears in every custom user data
document and that contains the user account ID of each
document's corresponding user.
- **enabled** (boolean)
  If `true`, custom user data is enabled.
- **mongo_service_id** (string)
  The _id value of a linked MongoDB data source.
    
You can list services with the
[Get all services endpoint](#operation/adminListServices).

Data sources are services whose `type` is "mongodb-atlas".
Use the `_id` value for the data source you want to link to
the Trigger.
- **on_user_creation_function_id** (string)
  The `_id` value of a [user creation
function](https://www.mongodb.com/ko-kr/docs/atlas/app-services/users/enable-custom-user-data/#std-label-user-creation-function)
that runs whenever a new user registers.

## Responses
### 204: Success


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