退款處理

執行付款請求後自動處理為買入，或執行分開買入則無法取消已授權的付款，只能採取退款處理。可以如下使用付款請求時輸入的訂單號碼，以獲得全額退款。

try {
  let refundResponse = await requestOfflineAPI({
    method: "POST",
    baseUrl: targetAPIServer,
    apiPath: `/v2/payments/orders/${orderId}/refund`,
  });

  console.log("Refund response: ", refundResponse);
} catch (error) {
  console.log(error);
}

若只需退還部分金額，請在主體參數部分輸入要部分退款的金額(refundAmount)，如下所示。

const refund = async function (orderId, amount = 0) {
  if (amount < 0) throw new Error("Amount cannot be negative number");

  const refundBody = amount > 0 ? { refundAmount: amount } : null;

  let refundResponse = await requestOfflineAPI({
    method: "POST",
    baseUrl: targetAPIServer,
    apiPath: `/v2/payments/orders/${orderId}/refund`,
    data: refundBody,
  });

  return refundResponse;
};

// ...

try {
  let response = refund("test_order_1", 500);

  console.log(response);
} catch (error) {
  console.log(error);
}

如果退款處理要求正常進行，則會回傳以下退款交易訊息回應。

{
  "returnCode": "0000",
  "returnMessage": "success",
  "info": {
    "refundTransactionId": 2018082512345678911,
    "refundTransactionDate": "2018-08-25T09:15:01Z"
  }
}