---
schema_version: "1"
id: 123235daca303303b45cad2913d08aaef3968a1c1b678c6ce822a55e55deb79b
title: ClientID
collection: developer
version: current
locale: en-us
portal_url: https://docs.salesforce.com/developer/current/en-us/marketing-cloud/guides/mc-apis/clientid.md
canonical_url: https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/clientid.html
source_site: developer.salesforce.com
content_type: documentation
content_hash: ceac8e694e366e0abde66fce90b27543df0b74a3b48128503a35ae6a1d61a5c2
products:
  - Marketing Cloud Engagement APIs and Programmatic Languages
  - Marketing Cloud
---
# 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.                                                                                                        |