# PostUsersSignInDataRequest ## Fields | Field | Type | Required | Description | Example | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `clientID` | *Optional* | :heavy_minus_sign: | The unique identifier for the client application
This is used to track the client application and its usage
(UUID, serial number, or other number unique per device)
| gcgzw5rz2xovp84b4vha3a40 | | `requestBody` | [Optional](../../models/operations/PostUsersSignInDataRequestBody.md) | :heavy_minus_sign: | Login credentials | |