code: def _get_fido_dollar(self, account_number, number):
          
          # Prepare data
          data = json.dumps({"fidoDollarBalanceFormList":
                             [{"phoneNumber": number,
                               "accountNumber": account_number}]})
          # Prepare headers
          headers_json = self._headers.copy()
          headers_json["Content-Type"] = "application/json;charset=UTF-8"
          # Http request
          try:
              raw_res = yield from self._session.post(FIDO_DOLLAR_URL,
                                                      data=data,
                                                      headers=headers_json,
                                                      timeout=self._timeout)
          except OSError:
              raise PyFidoError("Can not get fido dollar")
          # Get fido dollar
          try:
              json_content = yield from raw_res.json()
              fido_dollar_str = json_content\
                          .get("fidoDollarBalanceInfoList", [{}])[0]\
                          .get("fidoDollarBalance")
          except (OSError, ValueError):
              raise PyFidoError("Can not get fido dollar as json")
          if fido_dollar_str is None:
              raise PyFidoError("Can not get fido dollar")
          # Casting to float
          try:
              fido_dollar = float(fido_dollar_str)
          except ValueError:
              raise PyFidoError("Can not get fido dollar")
  
          return fido_dollar
docs: Get current Fido dollar balance.