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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def payloads(self):
 """ Access the payloads :returns: twilio.rest.api.v2010.account.recording.add_on_result.payload.PayloadList :rtype: twilio.rest.api.v2010.account.recording.add_on_result.payload.PayloadList """

        if self._payloads is None:
            self._payloads = PayloadList(
                self._version,
                account_sid=self._solution['account_sid'],
                reference_sid=self._solution['reference_sid'],
                add_on_result_sid=self._solution['sid'],
            )
        return self._payloads