code: function stashParams (req, res, next) {
    var id = crypto.randomBytes(10).toString('hex')
    var key = 'authorization:' + id
    var ttl = 1200 // 20 minutes
    var params = JSON.stringify(req.connectParams)
    var multi = client.multi()
  
    req.session.state = id
    req.authorizationId = id
  
    multi.set(key, params)
    multi.expire(key, ttl)
    multi.exec(function (err) {
      return next(err)
    })
  }
docs: Stash authorization params