code: def piggy_bank_deposit(self, device, _json):
          
          url_string = "{}/{}s/{}/deposits".format(self.BASE_URL,
                                                   device.object_type(),
                                                   device.object_id())
          try:
              arequest = requests.post(url_string,
                                       data=json.dumps(_json),
                                       headers=API_HEADERS)
              response_json = arequest.json()
              return response_json
          except requests.exceptions.RequestException:
              return None
docs: Args:
              device (WinkPorkfolioBalanceSensor): The piggy bank device to deposit to/withdrawal from.
              _json (String): The JSON string to perform the deposit/withdrawal.
          Returns:
              response_json (Dict): The API's response in dictionary format