visa.js

const request = require('superagent');
const config = require('./config/visa.json')

const userId = config.userId;
const password = config.password;

const authString = getBasicAuthHeader(userId, password);
console.log(authString);

function getBasicAuthHeader(userId, password) {
	return 'Basic ' + new Buffer(userId + ':' + password).toString('base64');
}

request
	.get('https://sandbox.api.visa.com/vmorc/offers/v1/all')
	.set('Authorization', authString)
	.set('Accept', 'application/json')
	.then(res => {
		console.log(res)
	})
	.catch(err => {
		console.log(`ERR: ${err.response.text}`)
	});