# ClientID

Contains identifying information for a business unit (BU) in Marketing Cloud Engagement.

This object is a data structure and isn’t queryable.

:::note
Use the `PartnerClientKey` property for compatibility with legacy code. Don’t use it in new code or integrations.
:::

## Properties

| Name               | Data Type | Description                                                                                                                               |
| ------------------ | --------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| `ClientID1`        | Int       | Deprecated.                                                                                                                               |
| `CreatedBy`        | Int       | Returns the ID of the user who created the object.                                                                                        |
| `CustomerKey`      | String    | User-supplied unique identifier for an object within an object type. This property corresponds to the external key assigned to an object. |
| `EnterpriseID`     | Long      | Not used.                                                                                                                                 |
| `ID`               | Int       | Read-only identifier for an object. Some objects use the ObjectID property as a unique ID.                                                |
| `ModifiedBy`       | Int       | Returns user ID for user who modified object.                                                                                             |
| `PartnerClientKey` | String    | User-defined partner key for an account.                                                                                                  |
| `PartnerUserKey`   | String    | Specifies the partner key value of a user.                                                                                                |
| `UserID`           | Int       | Indicates username for an account.                                                                                                        |