GraphQLReferenceMutationsaddToContactGroupOn this pageaddToContactGroup Add a contact to a contact group. A contact can belong to many contact groups. Input contactGroupAddInput Return Type ID Example mutation AddToGroup { addToContactGroup(input: { contactGroupId: "Y2dwMTIzNDU2" contactId: "Y29uMTIzNDU2" })} Related removeFromContactGroup ContactGroup type