code: public void completeTransfer(String connId, String parentConnId) throws WorkspaceApiException {
          this.completeTransfer(connId, parentConnId, null, null);
      }
docs: Complete a previously initiated two-step transfer using the provided IDs.
  @param connId The connection ID of the consult call (established).
  @param parentConnId The connection ID of the parent call (held).