var Worldpay = require('node-worldpay'),
    worldpay = new Worldpay({
        merchantCode: 'YOUR_MERCHANT_CODE',
        password: 'PASSWORD',
        installationId: 'INSTALLATION_ID',
        baseUrl: 'https://secure-test.worldpay.com/jsp/merchant/xml/paymentService.jsp'
    });

worldpay.charge({
    card: {
      number: '4945670000000',
      cvc: '000',
      expirationMonth: '03',
      expirationYear: '2016',
      holderName: "Ra's al Ghul"
    }
}, function(err, result){
    console.log(result.orderStatus[0].payment);
});