var generalOptions = {
  appHandler: app, // an Express application
  hostUrl: 'http://domain.here.com:port[/path]', // required for return URLs, and binding to optional /path
};

var tupas = require('tupas').create(generalOptions);

var bankOptions = [
  {
    id: 'nordea',
    imgPath: '/path/to/my/image.png',
    vendorId: 'production id',
    checksumKey: 'production key'
  },
  {
    id: 'my-new-bank',
    authUrl: "https://my.banks.url.com/tupas",
    version: "0002",
    keyVersion: "0001",
    idType: "01",
    imgPath: "/path/to/my/image.png",
    number: "420",
    vendorId: "xxxxxxx",
    checksumKey: "xxxxxxx"
  }
];

var tupas = require('tupas').create(generalOptions, bankOptions);

var requestId = "12345678987654321234"; // used as A01Y_STAMP
var buttonHtml = tupas.tupasButton('nordea', 'FI', requestId);

var params = tupas.buildRequestParams('nordea', 'FI', requestId);

var banks = tupas.banks
// => ['danskebank', 'handelsbanken', 'nordea',
//     'op', 'aktia', 'alandsbanken', 'spankki',
//     'saastopankki', 'poppankki', 'my-new-bank']

tupas.on('success', function (request, response) {
  // Successful tupas authentication. Get auth data from request.query.
});

tupas.on('mac-check-failed', function (request, response) {
  // Successful tupas authentication but the message was faulty.
});

tupas.on('cancel', function (request, response) {
  // User cancelled authentication.
});

tupas.on('reject', function (request, response) {
  // Authentication attempt was rejected by the bank.
});