title: How to integrate PayPal express checkout into angular2 typescript project
body: <p>Paypal provides an <a href="https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/basic-integration/" rel="noreferrer">easy way to integrate its express checkout solution</a> but what is the best solution to use this solution in an angular2 project working written in typescript?</p>