def piggy_bank_deposit(self, device, _json):
        """
        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
        """
        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