DataSync (Relationship) introduction
Relationships connect two entities. Every relationship belongs to a relationship class that defines which entity classes it may join and with what cardinality.
Use these endpoints to create, read, update, and delete relationships of any class you have defined.
Note: For more information, refer to the DataSync data model.
Authorization
Access Manager must be enabled on the keyset, and every DataSync request must carry exactly one credential: either an Access Manager token in auth, or a request signature. There is no anonymous access.
Supplying neither fails with 401 (DS-0203, UNAUTHENTICATED). Supplying both fails with 403 (DS-0201, ACCESS_DENIED), as does calling DataSync on a keyset without Access Manager enabled.
Refer to DataSync access control.