def verify(self, verifier, consumer_key=None, consumer_secret=None,
               access_token=None, access_token_secret=None):
        """
        After converting the token into verifier, call this to finalize the
        authorization.
        """
        # Stored values can be supplied to verify
        self.consumer_key = consumer_key or self.consumer_key
        self.consumer_secret = consumer_secret or self.consumer_secret
        self.access_token = access_token or self.access_token
        self.access_token_secret = access_token_secret or self.access_token_secret

        oauth = OAuth1(
            self.consumer_key,
            client_secret=self.consumer_secret,
            resource_owner_key=self.access_token,
            resource_owner_secret=self.access_token_secret,
            verifier=verifier)
        r = requests.post(self.url('ACCESS_TOKEN'), auth=oauth)
        if r.status_code == 200:
            creds = parse_qs(r.content)
        else:
            return (False, r.content)

        self.finalize_oauth(creds.get('oauth_token')[0],
                            creds.get('oauth_token_secret')[0])
        return (True, None)
After converting the token into verifier, call this to finalize the
        authorization.