| Client | ClientID | Specifies the account ownership and context of an object. |
| CorrelationID | xsd | Identifies correlation of objects across several requests. |
| CreatedDate | xsd | Read-only date and time of the object's creation. |
| CustomerKey | xsd | User-supplied unique identifier for an object within an object type. |
| ID | xsd | Read-only legacy identifier for an object. Not supported on all objects. |
| ModifiedDate | Nullable`1 | Last time object information was modified. |
| ObjectID | xsd | System-controlled, read-only text string identifier for object. |
| ObjectState | xsd | Reserved for future use. |
| Owner | Owner | Describes account ownership of subscriber in an on-your-behalf account. |
| PartnerKey | xsd | Unique identifier provided by partner for an object. This property is accessible only via API. |
| PartnerProperties | APIProperty[] | A collection of metadata supplied by the client and stored by the system. These properties are accessible only via API. |