code: def get_signalcheck(self, sar, **params):
          
          params = sar
          endpoint = 'rest/signal/check'
  
          # The 'sar'-request dictionary should be sent as valid JSON data, so
          # we need to convert it to JSON
          # when we construct the request in API.request
          retValue = self._API__request(endpoint, 'POST',
                                        params=params, convJSON=True)
  
          return retValue
docs: get_signalcheck -  perform a signal check.
  
          Parameters
          ----------
          sar : dict
              signal-api-request specified as a dictionary of parameters.
              All of these parameters are optional. For details
              check https://api.postcode.nl/documentation/signal-api-example.
  
          returns :
              a response dictionary