CONTACT_BUSINESS_GROUP_MANAGE CONTACT Endpoint
  /rpc/contact/?method=CONTACT_BUSINESS_GROUP_MANAGE  
  Object: 222. Click here for more information.  
  PARAMETERS    
  DataReturn Text A comma delimited list of advanced search fields to be returned after a successful save
  Id Numeric  
  Remove Numeric Pass '1' to remove the item
       
  ContactBusiness Numeric Mandatory. The business to add the group to
  Group Numeric Mandatory. The group to add to the business
  Notes Text (2000)  
  RETURN  
  id