# Advanced Integration Example ## Instructions 1. Add `CLIENT_ID` and `APP_SECRET` to the `.env` file 2. Run `npm install` 3. Run `npm start` 4. Open http://localhost:8888 5. Enter the credit card number provided from one of your [sandbox accounts](https://developer.paypal.com/dashboard/accounts) or [generate a new credit card](https://developer.paypal.com/dashboard/creditCardGenerator)