Operation to be made for the UploadUserDataRequest.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/services/user_data_service.proto)

| Fields ||
|---|---|
| ## `operation` Union field. Operation to be made for the UploadUserDataRequest. `operation` can be only one of the following: ||
| ### `create` | `https://developers.google.com/google-ads/api/reference/rpc/v26/UserData` The list of user data to be appended to the user list. |
| ### `remove` | `https://developers.google.com/google-ads/api/reference/rpc/v26/UserData` The list of user data to be removed from the user list. |