Paypal 支付功能的 C# .NET / JS 实现

互联网 18-8-10
说明

最近用到了 Paypal 支付功能,英语一般般的我也不得不硬着头皮踩一踩这样的坑。经过近乎半个月的作,终于实现了简单的支付功能,那么首先就说说使用 Paypal 必定要知道的几点(当前日期 2018年08月07日):

1. 你应该知道 Paypal 支付功能是支持银联卡的,但是不支持中国买家账号支付给中国卖家账号

2. Paypal 接口有两套,切记,产品环境和 sandbox 测试环境不同

3. 测试账号同样不能使用中国账号给中国账号付款

4. 如果你仅仅想具有固定金额的支付按钮,用你的 Paypal 商家账号登录官网,配置页里面完全可以配置出固定的支付按钮,然后 Copy 对应的 Html 到你的页面就 OK 了,也就没有必要通过更复杂的方式去支付了

5. 如果你必须动态价格和商品信息、或者你要学习基本的 Paypal 接口的话,那么就请静静的往下看吧

6. 真实环境支付 Paypal 每一笔都需要收取商家账号手续费的,并且手续费不低,如果你用真实环境测试,那么一定要记得每一笔都申请退款吧,退款很方便,商家后台就能直接发起,退款几乎是实时的。

Paypal 费用说明:https://www.paypal.com/businesswallet/fees/paypal-fees

相关资料

Paypal 官方地址:https://www.paypal.com/

Paypal 官方测试地址:https://www.sandbox.paypal.com

Paypal 开发者中心:https://developer.paypal.com/

Paypal API: https://api.paypal.com

Paypal sandbox API: https://api.sandbox.paypal.com

Paypal Checkout JS 支付模式

模式图片:

模式说明:

Checkout JS 模式是一种前端实现,使用官方提供的 Checkout.js SDK 实现支付,不需要自己写直接调用接口的代码,相对而言也挺简单,但是如果你想检测支付是否成功,你应当通过调用接口的方式验证了。

支付部分代码:

<p id="paypal-button"></p>
<script src="https://www.paypalobjects.com/api/checkout.js"></script>
<script type="text/javascript">     paypal.Button.render({         env: 'production', // production or sandbox 表示产品环境还是测试环境         client: {             production: '', // 产品环境,值为字符串,配置实际商家号的 ClientId             // sandbox: '', // 测试环境,值为字符串,配置商家测试号的 ClientId         },         style: {             size: 'medium',             color: 'black',             shape: 'pill',             label: 'paypal',             tagline: 'false',             fundingicons: 'true'         },         commit: true,         payment: function (data, actions) {             return actions.payment.create({                 transactions: [                     {                         amount: {                             total: "0.01",                             currency: "USD"                         },                         description: "测试商品描述",                         custom: "X00002"                     }                 ],                 redirect_urls: {                     return_url: 'http://localhost:4478/Success.aspx?type=js',                     cancel_url: 'http://localhost:4478/Cancel.aspx'                 }             });         },         onAuthorize: function (data, actions) {             return actions.payment.execute()                 .then(function () {                     actions.redirect();                 });         },         onCancel: function (data, actions) {             actions.redirect();         }     }, '#paypal-button'); </script>

如果你需要在支付跳转的成功页再次验证一下是否支付成功,你需要自己调用官方提供的 RESTful API,参见下文的 RESTful API 支付模式

RESTful API 支付模式

说明

接口的方式很常见,和支付宝的接口类似,只是使用了 RESTful API 的模式,采用了 Basic Auth 的加密方式。使用接口的模式很常规,我们在页面点击按钮调用支付接口,弹出支付页,支付成功跳转到成功页面,成功页面再调用确认支付接口确认结果。

支付接口调用:

using System; using System.Text; using System.Web.Script.Serialization; using cn.lovelong.Paypal.Config; using cn.lovelong.Paypal.Enums; using cn.lovelong.Paypal.Model;  namespace cn.lovelong.Paypal.Paypal {     /// <summary>     /// CreatePayment 的摘要说明     /// </summary>     public class CreatePayment     {         public CreatePayment()         {         }          public PaymentResult Pay(string json)         {             var jsonResult = HttpHelper.PostJson(                 UrlConfig.CreatePaymentUrl,                  AccountConfig.ClientId, AccountConfig.Secret, json,                 Encoding.UTF8);             var result = new JavaScriptSerializer().Deserialize<PaymentResult>(jsonResult);             return result;         }          public PaymentResult Pay(PaymentParam param)         {             var json = GetPayParams(param);             return Pay(json);         }                  public string GetPayParams(PaymentParam param)         {             var total = param.Total.ToString("N");             var currency = Enum.GetName(typeof (PaypalCurrency), param.Currency);             var payParams = new             {                 intent = "sale",                 redirect_urls = new                 {                     return_url = param.ReturnUrl,                     cancel_url = param.CancelUrl,                 },                 payer = new                 {                     payment_method = "paypal"                 },                 transactions = new dynamic[]                 {                     new                     {                         amount = new                         {                             total = total,                             currency = currency                         },                         description = param.Description,                         custom = param.Code,                         item_list = new                         {                             items = new dynamic[]                             {                                 new                                 {                                     name = param.Name,                                     //description = param.Name,                                     quantity = "1",                                     price = total,                                     //tax = "0.01",                                     //sku = "1",                                     currency = currency                                 }                             }                         }                     }                 }             };             var json = new JavaScriptSerializer().Serialize(payParams);             return json;         }          public string GetFullPayParams(decimal total, PaypalCurrency currency, string returnUrl, string cancelUrl)         {             var payParams = new             {                 intent = "sale",                 redirect_urls = new                 {                     return_url = returnUrl,                     cancel_url = cancelUrl,                 },                 payer = new                 {                     payment_method = "paypal"                 },                 transactions = new dynamic[]                 {                     new                     {                         amount = new                         {                             total = total.ToString("N"),                             currency = Enum.GetName(typeof(PaypalCurrency),currency),                             details = new                             {                                 subtotal = "30.00",                                 tax = "0.07",                                 shipping = "0.03",                                 handling_fee = "1.00",                                 shipping_discount = "-1.00",                                 insurance = "0.01"                             }                         },                         description = "",                         custom = "EBAY_EMS_90048630024435",                         invoice_number = "48787589673",                         payment_options = new                         {                             allowed_payment_method = "INSTANT_FUNDING_SOURCE"                         },                         soft_descriptor = "ECHI5786786",                         item_list = new                         {                             items = new dynamic[]                             {                                 new                                 {                                     name = "hat",                                     description = "Brown hat.",                                     quantity = "5",                                     price = "3",                                     tax = "0.01",                                     sku = "1",                                     currency = "USD"                                 }                             },                             shipping_address = new                             {                                 recipient_name = "Brian Robinson",                                 line1 = "4th Floor",                                 line2 = "Unit #34",                                 city = "San Jose",                                 country_code = "US",                                 postal_code = "95131",                                 phone = "011862212345678",                                 state = "CA"                             },                         }                     }                 }             };             var json = new JavaScriptSerializer().Serialize(payParams);             return json;         }     } }

确认支付接口:

using System.Text; using System.Web.Script.Serialization; using cn.lovelong.Paypal.Config; using cn.lovelong.Paypal.Model;  namespace cn.lovelong.Paypal.Paypal {     /// <summary>     /// Approved 的摘要说明     /// </summary>     public class Approved     {         public PaymentResult DoJson(string paymentId, dynamic json)         {             var jsonResult = HttpHelper.PostJson(string.Format(UrlConfig.ApprovedUrl, paymentId),                  AccountConfig.ClientId, AccountConfig.Secret, json, Encoding.UTF8);             var result = new JavaScriptSerializer().Deserialize<PaymentResult>(jsonResult);             return result;         }          public PaymentResult Do(string paymentId, string payerId)         {             var json = GetPayParams(payerId);             return DoJson(paymentId, json);         }          public string GetPayParams(string payerId)         {             var payParams = new             {                 payer_id = payerId             };             var json = new JavaScriptSerializer().Serialize(payParams);             return json;         }     } }

查询支付结果接口调用:

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Web.Script.Serialization; using cn.lovelong.Paypal.Config; using cn.lovelong.Paypal.Model;  namespace cn.lovelong.Paypal.Paypal {     public class ShowPaymentDetails     {         public PaymentResult Do(string paymentId)         {             var json = HttpHelper.Get(                 string.Format(UrlConfig.ShowPaymentDetailsUrl, paymentId),                  AccountConfig.ClientId, AccountConfig.Secret,                 Encoding.UTF8);             var result = new JavaScriptSerializer().Deserialize<PaymentResult>(json);             return result;         }     } }

最容易出问题的反而是通用类 HttpHelper:

using System; using System.Collections; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Security.Policy; using System.Text; using System.Threading.Tasks;  namespace cn.lovelong.Paypal {     public class HttpHelper     {         public static string PostForm(string url, string userName, string password, Dictionary<string,object> dic, Encoding encoding)         {             var param = string.Empty;             foreach (var o in dic)             {                 if (string.IsNullOrEmpty(param))                     param += o.Key + "=" + o.Value;                 else                     param += "&" + o.Key + "=" + o.Value;             }             byte[] byteArray = encoding.GetBytes(param);              //处理HttpWebRequest访问https有安全证书的问题( 请求被中止: 未能创建 SSL/TLS 安全通道。)             ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;                          HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);             request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(encoding.GetBytes(userName + ":" + password)));             request.PreAuthenticate = true;              request.Method = "POST";             request.ContentType = "application/x-www-form-urlencoded";             request.ContentLength = byteArray.Length;              //写入参数             Stream newStream = request.GetRequestStream();             newStream.Write(byteArray, 0, byteArray.Length);             newStream.Close();              using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())             {                 using (var stream = response.GetResponseStream())                 {                     if(stream != null)                     using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))                     {                         return sr.ReadToEnd();                     }                 }             }             return string.Empty;         }          public static string PostJson(string url, string userName, string password, string json, Encoding encoding)         {             byte[] byteArray = encoding.GetBytes(json);              //处理HttpWebRequest访问https有安全证书的问题( 请求被中止: 未能创建 SSL/TLS 安全通道。)             ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 |                                                     SecurityProtocolType.Tls;              HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);             request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(encoding.GetBytes(userName + ":" + password)));             request.PreAuthenticate = true;              request.Method = "POST";             request.Headers.Add("Cache-Control", "no-cache");             request.ContentType = "application/json";             request.ContentLength = byteArray.Length;              //写入参数             Stream newStream = request.GetRequestStream();             newStream.Write(byteArray, 0, byteArray.Length);             newStream.Close();              using (HttpWebResponse response = (HttpWebResponse) request.GetResponse())             {                 using (var stream = response.GetResponseStream())                 {                     if (stream != null)                         using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))                         {                             return sr.ReadToEnd();                         }                 }             }             return string.Empty;         }                  public static string Get(string url, string userName, string password, Encoding encoding)         {             //处理HttpWebRequest访问https有安全证书的问题( 请求被中止: 未能创建 SSL/TLS 安全通道。)             ServicePointManager.ServerCertificateValidationCallback += (s, cert, chain, sslPolicyErrors) => true;             ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 |                                                     SecurityProtocolType.Tls;              HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);             request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(encoding.GetBytes(userName + ":" + password)));             request.PreAuthenticate = true;              request.Method = "GET";             using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())             {                 using (var stream = response.GetResponseStream())                 {                     if (stream != null)                         using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))                         {                             return sr.ReadToEnd();                         }                 }             }             return string.Empty;         }     } }
主要的功能都已经实现了!看看演示 Demo 吧!
1. 支付页面
2. Checkout JS 方式(如果你的页面点击登录之后一直在第二个页面转圈的话,那只能说明你的登录账号不能支付你的商家账号,或者你的账号如果登录之后显示添加银行卡的提示,说明你的商家账号和你的账号都是中国账号,那你只能添加多币种卡支付,不能用银联支付了):
付款就好了!
3. 接口方式我就没有使用弹出页面了,最简单的方式(接口会直接在调用接口的页面触发支付跳转),点击接口支付
我就不支付了,我用的商家账号是自己的新加坡的账号, 按照今天的汇率 $0.01 = ¥0.068,你至少需要支付 0.07 元才能完成支付,而文章开头也说了,商家需要付税,也就是说你支付的 0.07 都会变成给 Paypal 的税,商家一分钱也拿不到,也就是说,你至少支付 3.5元人民币($0.51 = ¥3.481)商家才能得到微额的款项。
下面给出 Demo 源码,源码中配置的商家号是我自己的,请自行修改,为了方便大家没有商家账号的朋友做测试我就不删除了,朋友们也不要真的支付测试,你的测试只会让 Paypal 赚钱而已!
我的开发环境是 VS2015 + C# 6.0 + JS ,代码仅供参考,请自行修改扩展学习使用!

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