code: def get_access_tokens(self, oauth_verifier):
          
          qb_service = OAuth1Service(
              consumer_key=self.consumer_key,
              consumer_secret=self.consumer_secret,
              request_token_url=self.request_token_url,
              access_token_url=self.access_token_url,
              authorize_url=self.authorize_url,
          )
  
          session = qb_service.get_auth_session(
              self.request_token,
              self.request_token_secret,
              data={'oauth_verifier': oauth_verifier})
  
          self.access_token = session.access_token
          self.access_token_secret = session.access_token_secret
          return session
docs: Wrapper around get_auth_session, returns session, and sets access_token and
          access_token_secret on the QB Object.
          :param oauth_verifier: the oauth_verifier as specified by OAuth 1.0a