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
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
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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