docs: function Strategy(options, verify) {
    if (typeof options == 'function') {
      verify = options;
      options = {};
    }
    if (!verify) { throw new TypeError('PinStrategy requires a verify callback'); }
    
    this._pinField = options.pinField || 'pin';
    
    
    passport.Strategy.call(this);
    this.name = 'pin';
    this._verify = verify;
    this._passReqToCallback = options.passReqToCallback;
  }