[.Net][C#] 串接 LinePay v3 -01－封神者

創建一個全新 Linepayv3.aspx後，在 Linepayv3.aspx.cs 作業

[共用變數]
string ChannelId = "XXXXXXXXXX", ChannelSecret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
string apiPay = "https://api-pay.line.me";
//string apiPay = "https://sandbox-api-pay.line.me";
string apiurl = "/v3/payments/request";
string reqJSON = "", ValueInToken = "", nonce = "", orderId = "";
string totalC = "", Signature = "", transId = "";

protected void Page_Load(object sender, EventArgs e)
{
　　// http -> https 沒加這行 [.Net] 好像會預設 TLS1.0 (->強制用 TLS1.2以上)
　　ServicePointManager.SecurityProtocol = (SecurityProtocolType)768 | (SecurityProtocolType)3072;
　　..........(略)
}

protected string HmacSHA256(string message, string key)
{
  key = key ?? "";
var encoding = new System.Text.UTF8Encoding();
byte[] keyByte = encoding.GetBytes(key);
byte[] messageBytes = encoding.GetBytes(message);
using (var hmacsha256 = new HMACSHA256(keyByte))
{
byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
return Convert.ToBase64String(hashmessage);
}
}

protected void RequestAPI(string orderID)
{
//呼叫訂單資料，須包含總總(sum(單價x數量) + (運費)) / 運費 / 訂單編號
//呼叫訂單子項資料，商品編號 / 商品名稱 / 數量 / 商品單價 / 商品主圖

    // 取得亂數隨機數
    nonce = Guid.NewGuid().ToString();
    // 使用LinQ 把上面的訂單資料串成匿名object List
    var reqJson = new
   {
       amount = Convert.ToInt32(totalC),
       currency = "TWD",
       orderId = orderID,
       packages = new List<object>
       {
           new {
           id = orderID,
           amount = Convert.ToInt32(totalC),
           products = from oi in objList
                   .AsEnumerable()
                   .Select((oi, index) => new
                   {
                       id = (index + 1),
                       name = "商品Name",
                       imageUrl = "imageUrl",
                       quantity = 1,
                       price = "商品Cash"
                   })
                   select oi
            }
        },
        redirectUrls = new
        {
           confirmUrl = "使用者付款後導向此頁"
           ,cancelUrl = "使用者取消付款後導向此頁"
        }
    };
    ValueInToken = JsonConvert.SerializeObject(reqJson);
    Signature = webLib.HmacSHA256((ChannelSecret + apiurl + ValueInToken + nonce), ChannelSecret);
   // 設定 POST 到 LinePay 界街網址(※注意是測試環境或正式環境)
   HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(apiPay + apiurl);
   httpWebRequest.ContentType = "application/json; charset=UTF-8";
   httpWebRequest.Method = "POST";
   httpWebRequest.Headers.Add("X-LINE-ChannelId", ChannelId);
   httpWebRequest.Headers.Add("X-LINE-Authorization", Signature);
   httpWebRequest.Headers.Add("X-LINE-Authorization-Nonce", nonce);

   using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
   {
       streamWriter.Write(ValueInToken);
       streamWriter.Flush();
       streamWriter.Close();
   }
   var response = (HttpWebResponse)httpWebRequest.GetResponse();
   var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
   var backModel = JsonConvert.DeserializeObject(responseString);
   Response.Write("backModel= " + backModel.ToString() + "<br />");

// 最後增加自動跳轉到 LinePay介面
// jsonObj = [returnCode, returnMessage, info[paymentUrl[web,App],transactionId,paymentAccessToken]]
string linePayUrl="";
JObject jsonObj = JObject.Parse(backModel.ToString());
if (jsonObj["returnCode"].ToString() =="0000")
{
   linePayUrl = jsonObj["info"]["paymentUrl"]["web"].ToString();
     Response.Write("<script>location.href='" + linePayUrl + "'; </script>");
  }
}
如果執行後有看到： "returnCode": "0000", "returnMessage": "Success." 就表示數據有成功傳送過去