## Custom storage 
Claims that are contained in the token after authentication if you use [custom storage](https://developers.xsolla.com/doc/login/integration-guide/connect-users-storage/).
| Claim | Type | Required | Description |
|  --- | --- | --- | --- |
| `provider` | string | Yes | Name of a social network used for authentication. If the user authenticates via username and password, the claim has the `xsolla` value. |
| `external_account_id` | string |  | User ID on your server side. |
| `partner_data` |  |  | Data of any type returned by your server in the response body during authentication. To enable the transmission of this claim, contact your Customer Success Manager or email [csm@xsolla.com](mailto:csm@xsolla.com). |
| `social_access_token` |  |  | Access token of the social network through which the user was authenticated. To enable the transmission of this claim, contact your Customer Success Manager or email [csm@xsolla.com](mailto:csm@xsolla.com). |