Note: This endpoint is deprecated. Use the CRM Associations API to manage deal associations.
Updates the association between an existing deal and a contact or company. The deal can be associated with either contacts or companies with each request. This endpoint supports associating more than one object IDs of a particular object type at once.
Note: You only need to use this endpoint when updating existing deal records. If you are creating new deals, you can make these associations when creating the record by including the
associations data as documented on the create deal page.