code: function Beanstream (options) {
    this.endpoint = 'https://www.beanstream.com/api/';
    this.version = 'v1';
    this.token_endpoint = 'https://www.beanstream.com/scripts/tokenization/tokens';
    var merchant_id = options.MERCHANT_ID;
    var api_passcode = options.API_PASSCODE;
  
    var passcode = new Buffer([merchant_id, api_passcode].join(":")).toString('base64');
    this.authHeader = "Passcode " + passcode;
    BaseGateway.call(this, options);
  }
docs: *
  
  Beanstream Request Setup
  
  *