def refresh(self):
        """
        Refresh access token. Only non-expired tokens can be renewed.

        :Example:

        token = client.tokens.refresh()
        """
        uri = "%s/%s" % (self.uri, "refresh")
        response, instance = self.request("GET", uri)
        return response.ok
Refresh access token. Only non-expired tokens can be renewed.

        :Example:

        token = client.tokens.refresh()