婚禮禮金用Line Pay II (26)

第12 屆iT邦幫忙鐵人賽系列文章 (Day26)

以下是 Line 官方文件的流程，今天會依據這個圖的流程來實作 Line Pay 付款

<a href="https://pay.line.me/jp/developers/apis/onlineApis?locale=zh_TW">https://pay.line.me/jp/developers/apis/onlineApis?locale=zh_TW</a> https://pay.line.me/jp/developers/apis/onlineApis?locale=zh_TW

Checkout 流程

官方API文件可以從這裡看到

Request Body 的 C# Class

public class LinePayRequest

{

public int amount { get; set; }

public string currency { get; set; }

public string orderId { get; set; }

public List<Package> packages { get; set; }

public Options options { get; set; }

public Redirecturls redirectUrls { get; set; }

}

public class Package

{

public string id { get; set; }

public int amount { get; set; }

public string name { get; set; }

public List<Product> products { get; set; }

}

public class Product

{

public string id { get; set; }

public string name { get; set; }

public string imageUrl { get; set; }

public int quantity { get; set; }

public int price { get; set; }

}

public class Options

{

public Payment payment { get; set; }

}

public class Payment

{

public bool capture { get; set; }

}

public class Redirecturls

{

public string confirmUrl { get; set; }

public string cancelUrl { get; set; }

}

整個 Post 的 Body 可以這樣組成，channelId和channelSecret可以在前一篇申請sandbox時候取得

但 Line Pay 在發 Request 的時候必須把 PostBody 加密，寫了個 method 處理

string Signature = HashLinePayRequest(channelSecret, apiUrl, body, orderId, channelSecret);

private static string HashLinePayRequest(string channelSecret, string apiUrl, string body, string orderId, string key)

{

var request = channelSecret + apiUrl + body + orderId;

key = key ?? "";

var encoding = new System.Text.UTF8Encoding();

byte[] keyByte = encoding.GetBytes(key);

byte[] messageBytes = encoding.GetBytes(request);

using (var hmacsha256 = new HMACSHA256(keyByte))

{

byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);

return Convert.ToBase64String(hashmessage);

}

}

在 Post 的時候 Header 也要加一些 Line 的驗證資訊

result 可以用 JSON.NET轉強行別

JsonConvert.DeserializeObject<LinePayResponse>(result)

LinePayResponse.cs

public class LinePayResponse

{

public string returnCode { get; set; }

public string returnMessage { get; set; }

public Info info { get; set; }

}

public class Info

{

public Paymenturl paymentUrl { get; set; }

public long transactionId { get; set; }

public string paymentAccessToken { get; set; }

}

public class Paymenturl

{

public string web { get; set; }

public string app { get; set; }

}

在 Razor Page 導頁到 Line Server 進行付款