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// Note: This code is intended as a *pseudocode* example. Each server platform and programming language has a different way of handling requests, making HTTP API calls, and serving responses to the browser. // 1. Set up your server to make calls to PayPal // 1a. Add your client ID and secret PAYPAL_CLIENT = 'PAYPAL_SANDBOX_CLIENT'; PAYPAL_SECRET = 'PAYPAL_SANDBOX_SECRET'; // 1b. Point your server to the PayPal API PAYPAL_OAUTH_API = 'https://api.sandbox.paypal.com/v1/oauth2/token/'; PAYPAL_ORDER_API = 'https://api.sandbox.paypal.com/v2/checkout/orders/'; // 1c. Get an access token from the PayPal API basicAuth = base64encode(`${ PAYPAL_CLIENT }:${ PAYPAL_SECRET }`); auth = http.post(PAYPAL_OAUTH_API { headers: { Accept: `application/json`, Authorization: `Basic ${ basicAuth }` }, data: `grant_type=client_credentials` }); // 2. Set up your server to receive a call from the client function handleRequest(request, response) { // 2a. Get the order ID from the request body orderID = request.body.orderID; // 3. Call PayPal to get the transaction details details = http.get(PAYPAL_ORDER_API + orderID, { headers: { Accept: `application/json`, Authorization: `Bearer ${ auth.access_token }` } }); // 4. Handle any errors from the call if (details.error) { return response.send(500); } // 5. Validate the transaction details are as expected if (details.purchase_units[0].amount.value !== '5.77') { return response.send(400); } // 6. Save the transaction in your database database.saveTransaction(orderID); // 7. Return a successful response to the client return response.send(200);
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