def _proxy(self):
        """
        Generate an instance context for the instance, the context is capable of
        performing various actions.  All instance actions are proxied to the context

        :returns: CertificateContext for this CertificateInstance
        :rtype: twilio.rest.preview.deployed_devices.fleet.certificate.CertificateContext
        """
        if self._context is None:
            self._context = CertificateContext(
                self._version,
                fleet_sid=self._solution['fleet_sid'],
                sid=self._solution['sid'],
            )
        return self._context
Generate an instance context for the instance, the context is capable of
        performing various actions.  All instance actions are proxied to the context

        :returns: CertificateContext for this CertificateInstance
        :rtype: twilio.rest.preview.deployed_devices.fleet.certificate.CertificateContext