code: def cancel_signature_request(self, signature_request_id):
          ''' Cancels a SignatureRequest
  
          Cancels a SignatureRequest. After canceling, no one will be able to sign
          or access the SignatureRequest or its documents. Only the requester can
          cancel and only before everyone has signed.
  
          Args:
  
              signing_request_id (str): The id of the signature request to cancel
  
          Returns:
              None
  
          '''
          request = self._get_request()
          request.post(url=self.SIGNATURE_REQUEST_CANCEL_URL + signature_request_id, get_json=Falsef cancel_signature_request(self, signature_request_id):
          ''' Cancels a SignatureRequest
  
          Cancels a SignatureRequest. After canceling, no one will be able to sign
          or access the SignatureRequest or its documents. Only the requester can
          cancel and only before everyone has signed.
  
          Args:
  
              signing_request_id (str): The id of the signature request to cancel
  
          Returns:
              None
  
          '''
          request = self._get_request()
          request.post(url=self.SIGNATURE_REQUEST_CANCEL_URL + signature_request_id, get_json=False)
docs: Cancels a SignatureRequest
  
          Cancels a SignatureRequest. After canceling, no one will be able to sign
          or access the SignatureRequest or its documents. Only the requester can
          cancel and only before everyone has signed.
  
          Args:
  
              signing_request_id (str): The id of the signature request to cancel
  
          Returns:
              None