code: function createAuthKey(callback, channel) {
  
      flow.retryUntilIsDone(callback, null,
          function (callback) {
              flow.runSeries([
                  require('./request-pq'),
                  require('./request-dh-params'),
                  require('./set-client-dh-params')
              ], callback, channel);
          });
  }
docs: Create the authorization key