You can schedule a payment for a desired time in the future by using the ChaiPort Schedule payment API.
Node.js
// Schedule paymentaxios({ url: \`https://api.iamport.kr/subscribe/payments/schedule\`, method: "post", headers: { "Authorization": access_token }, // Add access token to authorization header data: { customer_uid: "gildong_0001_1234", // Unique ID for each card (billing key) schedules: [ { merchant_uid: "order_monthly_0001", // Order ID schedule_at: 1519862400, // Schedule time in UNIX timestamp. amount: 8900, name: "Recurring payment for monthly subscription", buyer_name: "Hong Gildong", buyer_tel: "01012345678", buyer_email: "gildong@gmail.com" } ] } });
STEP 02. Receive payment result
When payment is attempted at the scheduled time, a webhook event occurs and the payment ID (imp_uid) and order ID (merchant_uid) are sent to the specified callback URL on the server. After receiving the payment result via webhook, you can complete the payment processing based on the result.
i'mport Webhook
For information about the i'mport Webhook and how to set the callback URL, refer to the i'mport webhook guide.
server-side
// Process POST request to "/iamport-callback/schedule"app.post("/iamport-callback/schedule",async (req, res) => {try {const { imp_uid,merchant_uid } =req.body;// Get access tokenconstgetToken=awaitaxios({ url:"https://api.iamport.kr/users/getToken", method:"post",// POST method headers: { "Content-Type":"application/json" },// "Content-Type": "application/json" data: { imp_key:"imp_apikey",// REST API key imp_secret: "ekKoeW8RyKuT0zgaZsUtXXTLQ4AhPFW3ZGseDA6bkA5lamv9OqDMnxyeB9wqOsuO9W3Mx9YSJ4dTqJ3f" // REST API Secret
} });const { access_token } =getToken.data.response; // Access token// Get payment info from i'mport server using imp_uidconstgetPaymentData=awaitaxios({ url: \`https://api.iamport.kr/payments/\${imp_uid}\`, // Pass imp_uid method: "get", // GET method headers: { "Authorization": access_token } // Add access token to authorization header }); const paymentData = getPaymentData.data.response; // Save payment info const { status } = paymentData; if (status === "paid") { // If payment is successful // Save payment info in DB await Orders.findByIdAndUpdate(merchant_uid, { $set: paymentData }); // Mongoose ... } else { // Retry payment } } catch (e) { res.status(400).send(e); } });
Recurring payment
To implement recurring payments, recursively schedule a payment to the i'mport server. When a payment is attempted at the scheduled time, a notification is sent to the server through the webhook URL.
server-side
// Process POST request to "/iamport-callback/schedule"app.post("/iamport-callback/schedule",async (req, res) => {try {const { imp_uid,merchant_uid } =req.body;// Get access token/* ...Omitted ... */// Get payment info from i'mport server using imp_uid/* ...Omitted ... */constpaymentData=getPaymentData.data.response; // Save payment infoconst { status } = paymentData;if (status ==="paid") { // If payment is successful// Save payment info in DBawaitOrders.findByIdAndUpdate(merchant_uid, { $set: paymentData }); // Mongoose...// Schedule next paymentaxios({ url:"{URL to receive payment schedule}",// Example: https://api.iamport.kr/subscribe/payments/schedule method:"post", headers: { "Authorization": access_token },// Add access token to authorization header data: { customer_uid:"gildong_0001_1234",// Unique ID for each card (billing key) schedules: [ { merchant_uid:"order_monthly_0001",// Order ID schedule_at:1519516800,// Schedule time in UNIX timestamp. amount:8900, name:"Recurring payment for monthly subscription",... } ] } }); } else {// Retry payment } } catch (e) {res.status(400).send(e); } });
The above example processes the webhook event that occurs when a scheduled payment is attempted. If the scheduled payment is completed successfully, the payment information is saved in the database and the next payment is scheduled.