code: public BoxRequestsShare.UpdateCollaboration getUpdateRequest(String collaborationId) {
          BoxRequestsShare.UpdateCollaboration collab = new BoxRequestsShare.UpdateCollaboration(collaborationId, getCollaborationInfoUrl(collaborationId), mSession);
          return collab;
      }
docs: A request to update a collaboration given a collaboration id. Note this request itself will not update collaboration.
  In order to update you will need to call the methods in UpdateCollaboration class. e.g., to update the collaboration role,
  call setNewRole() method after getting the request; to update the collaboration status, call setNewStatus after getting the request.
  
  @param collaborationId id of the collaboration to update
  @return request to update a collaboration