docs: function OneTimeToken (options) {
    this._id = options._id || crypto.randomBytes(32).toString('hex')
    this.exp = options.exp
    this.use = options.use
    this.sub = options.sub
  
    if (options.ttl) {
      this.exp = Math.round(Date.now() / 1000) + options.ttl
    }
  }