/**
  * Send a new SignatureRequest with the submitted documents
  *
  * @param  SignatureRequest $request
  * @return SignatureRequest
  * @throws BaseException
  */
 public function sendSignatureRequest(SignatureRequest $request)
 {
     $response = $this->rest->post(static::SIGNATURE_REQUEST_SEND_PATH, $request->toParams());
     $this->checkResponse($response);
     return $request->fromResponse($response);
 }