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admin/services/paypal/node/standard-integration/.env

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+CLIENT_ID=<FILL_THIS_IN>
+APP_SECRET=<FILL_THIS_IN>

admin/services/paypal/node/standard-integration/README.md

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+# Standard Integration Example
+
+This folder contains example code for a standard PayPal integration using both the JS SDK and node.js to complete transactions with the PayPal REST API.
+
+## Instructions
+
+1. [Create an application](https://developer.paypal.com/dashboard/applications/sandbox/create)
+3. Add your app's `CLIENT_ID` and `APP_SECRET` to the `.env` file
+2. Replace `test` in `public/index.html` with your app's client-id
+4. Run `npm install`
+5. Run `npm start`
+6. Open http://localhost:8888
+7. Click "PayPal" and log in with one of your [Sandbox test accounts](https://developer.paypal.com/dashboard/accounts).

admin/services/paypal/node/standard-integration/package.json

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+{
+  "name": "@paypalcorp/standard-integration",
+  "version": "1.0.0",
+  "main": "paypal-api.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "author": "",
+  "license": "Apache-2.0",
+  "description": "",
+  "dependencies": {
+    "dotenv": "^16.0.0",
+    "express": "^4.17.3",
+    "node-fetch": "^3.2.1"
+  }
+}

admin/services/paypal/node/standard-integration/paypal-api.js

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+import fetch from "node-fetch";
+
+const { CLIENT_ID, APP_SECRET } = process.env;
+const base = "https://api-m.sandbox.paypal.com";
+
+export async function createOrder() {
+  const accessToken = await generateAccessToken();
+  const url = `${base}/v2/checkout/orders`;
+  const response = await fetch(url, {
+    method: "post",
+    headers: {
+      "Content-Type": "application/json",
+      Authorization: `Bearer ${accessToken}`,
+    },
+    body: JSON.stringify({
+      intent: "CAPTURE",
+      purchase_units: [
+        {
+          amount: {
+            currency_code: "USD",
+            value: "100.00",
+          },
+        },
+      ],
+    }),
+  });
+
+  return handleResponse(response);
+}
+
+export async function capturePayment(orderId) {
+  const accessToken = await generateAccessToken();
+  const url = `${base}/v2/checkout/orders/${orderId}/capture`;
+  const response = await fetch(url, {
+    method: "post",
+    headers: {
+      "Content-Type": "application/json",
+      Authorization: `Bearer ${accessToken}`,
+    },
+  });
+
+  return handleResponse(response);
+}
+
+export async function generateAccessToken() {
+  const auth = Buffer.from(CLIENT_ID + ":" + APP_SECRET).toString("base64");
+  const response = await fetch(`${base}/v1/oauth2/token`, {
+    method: "post",
+    body: "grant_type=client_credentials",
+    headers: {
+      Authorization: `Basic ${auth}`,
+    },
+  });
+
+  const jsonData = await handleResponse(response);
+  return jsonData.access_token;
+}
+
+async function handleResponse(response) {
+  if (response.status === 200 || response.status === 201) {
+    return response.json();
+  }
+
+  const errorMessage = await response.text();
+  throw new Error(errorMessage);
+}

admin/services/paypal/node/standard-integration/public/index.html

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+  </head>
+  <body>
+    <!-- Replace "test" with your own sandbox Business account app client ID -->
+    <script src="https://www.paypal.com/sdk/js?client-id=test&currency=USD"></script>
+    <!-- Set up a container element for the button -->
+    <div id="paypal-button-container"></div>
+    <script>
+      paypal
+        .Buttons({
+          // Sets up the transaction when a payment button is clicked
+          createOrder: function () {
+            return fetch("/api/orders", {
+              method: "post",
+              // use the "body" param to optionally pass additional order information
+              // like product skus and quantities
+              body: JSON.stringify({
+                cart: [
+                  {
+                    sku: "<YOUR_PRODUCT_STOCK_KEEPING_UNIT>",
+                    quantity: "<YOUR_PRODUCT_QUANTITY>",
+                  },
+                ],
+              }),
+            })
+              .then((response) => response.json())
+              .then((order) => order.id);
+          },
+          // Finalize the transaction after payer approval
+          onApprove: function (data) {
+            return fetch(`/api/orders/${data.orderID}/capture`, {
+              method: "post",
+            })
+              .then((response) => response.json())
+              .then((orderData) => {
+                // Successful capture! For dev/demo purposes:
+                console.log(
+                  "Capture result",
+                  orderData,
+                  JSON.stringify(orderData, null, 2)
+                );
+                var transaction =
+                  orderData.purchase_units[0].payments.captures[0];
+                alert(
+                  "Transaction " +
+                    transaction.status +
+                    ": " +
+                    transaction.id +
+                    "\n\nSee console for all available details"
+                );
+                // When ready to go live, remove the alert and show a success message within this page. For example:
+                // var element = document.getElementById('paypal-button-container');
+                // element.innerHTML = '<h3>Thank you for your payment!</h3>';
+                // Or go to another URL:  actions.redirect('thank_you.html');
+              });
+          },
+        })
+        .render("#paypal-button-container");
+    </script>
+  </body>
+</html>

admin/services/paypal/node/standard-integration/server.js

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+import "dotenv/config"; // loads variables from .env file
+import express from "express";
+import * as paypal from "./paypal-api.js";
+
+const app = express();
+
+app.use(express.static("public"));
+
+app.post("/api/orders", async (req, res) => {
+  try {
+    const order = await paypal.createOrder();
+    res.json(order);
+  } catch (err) {
+    res.status(500).send(err.message);
+  }
+});
+
+app.post("/api/orders/:orderID/capture", async (req, res) => {
+  const { orderID } = req.params;
+  try {
+    const captureData = await paypal.capturePayment(orderID);
+    res.json(captureData);
+  } catch (err) {
+    res.status(500).send(err.message);
+  }
+});
+
+app.listen(8888);