說(shuō)明

最近用到了 Paypal 支付功能，英語(yǔ)一般般的我也不得不硬著頭皮踩一踩這樣的坑。經(jīng)過(guò)近乎半個(gè)月的作，終于實(shí)現(xiàn)了簡(jiǎn)單的支付功能，那么首先就說(shuō)說(shuō)使用 Paypal 必定要知道的幾點(diǎn)（當(dāng)前日期 2018年08月07日）：

1. 你應(yīng)該知道 Paypal 支付功能是支持銀聯(lián)卡的，但是不支持中國(guó)買家賬號(hào)支付給中國(guó)賣家賬號(hào)

2. Paypal 接口有兩套，切記，產(chǎn)品環(huán)境和 sandbox 測(cè)試環(huán)境不同

3. 測(cè)試賬號(hào)同樣不能使用中國(guó)賬號(hào)給中國(guó)賬號(hào)付款

4. 如果你僅僅想具有固定金額的支付按鈕，用你的 Paypal 商家賬號(hào)登錄官網(wǎng)，配置頁(yè)里面完全可以配置出固定的支付按鈕，然后 Copy 對(duì)應(yīng)的 Html 到你的頁(yè)面就 OK 了，也就沒(méi)有必要通過(guò)更復(fù)雜的方式去支付了

5. 如果你必須動(dòng)態(tài)價(jià)格和商品信息、或者你要學(xué)習(xí)基本的 Paypal 接口的話，那么就請(qǐng)靜靜的往下看吧

6. 真實(shí)環(huán)境支付 Paypal 每一筆都需要收取商家賬號(hào)手續(xù)費(fèi)的，并且手續(xù)費(fèi)不低，如果你用真實(shí)環(huán)境測(cè)試，那么一定要記得每一筆都申請(qǐng)退款吧，退款很方便，商家后臺(tái)就能直接發(fā)起，退款幾乎是實(shí)時(shí)的。

Paypal 費(fèi)用說(shuō)明：https://www.paypal.com/businesswallet/fees/paypal-fees

?相關(guān)資料

Paypal 官方地址：https://www.paypal.com/

Paypal 官方測(cè)試地址：https://www.sandbox.paypal.com

Paypal 開(kāi)發(fā)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

模式圖片：

?

模式說(shuō)明：

Checkout JS 模式是一種前端實(shí)現(xiàn)，使用官方提供的 Checkout.js SDK 實(shí)現(xiàn)支付，不需要自己寫(xiě)直接調(diào)用接口的代碼，相對(duì)而言也挺簡(jiǎn)單，但是如果你想檢測(cè)支付是否成功，你應(yīng)當(dāng)通過(guò)調(diào)用接口的方式驗(yàn)證了。

支付部分代碼：

<p id="paypal-button"></p>

<script src="https://www.paypalobjects.com/api/checkout.js"></script>

<script type="text/javascript">
    paypal.Button.render({
        env: &#39;production&#39;, // production or sandbox 表示產(chǎn)品環(huán)境還是測(cè)試環(huán)境
        client: {
            production: &#39;&#39;, // 產(chǎn)品環(huán)境，值為字符串，配置實(shí)際商家號(hào)的 ClientId
            // sandbox: &#39;&#39;, // 測(cè)試環(huán)境，值為字符串，配置商家測(cè)試號(hào)的 ClientId
        },
        style: {
            size: &#39;medium&#39;,
            color: &#39;black&#39;,
            shape: &#39;pill&#39;,
            label: &#39;paypal&#39;,
            tagline: &#39;false&#39;,
            fundingicons: &#39;true&#39;
        },
        commit: true,
        payment: function (data, actions) {
            return actions.payment.create({
                transactions: [
                    {
                        amount: {
                            total: "0.01",
                            currency: "USD"
                        },
                        description: "測(cè)試商品描述",
                        custom: "X00002"
                    }
                ],
                redirect_urls: {
                    return_url: &#39;http://localhost:4478/Success.aspx?type=js&#39;,
                    cancel_url: &#39;http://localhost:4478/Cancel.aspx&#39;
                }
            });
        },
        onAuthorize: function (data, actions) {
            return actions.payment.execute()
                .then(function () {
                    actions.redirect();
                });
        },
        onCancel: function (data, actions) {
            actions.redirect();
        }
    }, &#39;#paypal-button&#39;);
</script>

如果你需要在支付跳轉(zhuǎn)的成功頁(yè)再次驗(yàn)證一下是否支付成功，你需要自己調(diào)用官方提供的 RESTful API，參見(jiàn)下文的 RESTful API 支付模式

RESTful API 支付模式

說(shuō)明

接口的方式很常見(jiàn)，和支付寶的接口類似，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規(guī)，我們?cè)陧?yè)面點(diǎn)擊按鈕調(diào)用支付接口，彈出支付頁(yè)，支付成功跳轉(zhuǎn)到成功頁(yè)面，成功頁(yè)面再調(diào)用確認(rèn)支付接口確認(rèn)結(jié)果。

支付接口調(diào)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 的摘要說(shuō)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;
        }
    }
}

確認(rèn)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 的摘要說(shuō)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;
        }
    }
}

查詢支付結(jié)果接口調(diào)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;
        }
    }
}

最容易出問(wèn)題的反而是通用類 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);

            //處理HttpWebRequest訪問(wèn)https有安全證書(shū)的問(wèn)題（ 請(qǐng)求被中止: 未能創(chuàng)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;

            //寫(xiě)入?yún)?shù)
            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);

            //處理HttpWebRequest訪問(wèn)https有安全證書(shū)的問(wèn)題（ 請(qǐng)求被中止: 未能創(chuàng)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;

            //寫(xiě)入?yún)?shù)
            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)
        {
            //處理HttpWebRequest訪問(wèn)https有安全證書(shū)的問(wèn)題（ 請(qǐng)求被中止: 未能創(chuàng)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;
        }
    }
}

主要的功能都已經(jīng)實(shí)現(xiàn)了！看看演示 Demo 吧！

1. 支付頁(yè)面

2. Checkout JS 方式（如果你的頁(yè)面點(diǎn)擊登錄之后一直在第二個(gè)頁(yè)面轉(zhuǎn)圈的話，那只能說(shuō)明你的登錄賬號(hào)不能支付你的商家賬號(hào)，或者你的賬號(hào)如果登錄之后顯示添加銀行卡的提示，說(shuō)明你的商家賬號(hào)和你的賬號(hào)都是中國(guó)賬號(hào)，那你只能添加多幣種卡支付，不能用銀聯(lián)支付了）：

付款就好了！

3. 接口方式我就沒(méi)有使用彈出頁(yè)面了，最簡(jiǎn)單的方式（接口會(huì)直接在調(diào)用接口的頁(yè)面觸發(fā)支付跳轉(zhuǎn)），點(diǎn)擊接口支付

我就不支付了，我用的商家賬號(hào)是自己的新加坡的賬號(hào)， 按照今天的匯率 $0.01 = ￥0.068，你至少需要支付 0.07 元才能完成支付，而文章開(kāi)頭也說(shuō)了，商家需要付稅，也就是說(shuō)你支付的 0.07 都會(huì)變成給 Paypal 的稅，商家一分錢也拿不到，也就是說(shuō)，你至少支付 3.5元人民幣（$0.51 = ￥3.481）商家才能得到微額的款項(xiàng)。

下面給出 Demo 源碼，源碼中配置的商家號(hào)是我自己的，請(qǐng)自行修改，為了方便大家沒(méi)有商家賬號(hào)的朋友做測(cè)試我就不刪除了，朋友們也不要真的支付測(cè)試，你的測(cè)試只會(huì)讓 Paypal 賺錢而已！

我的開(kāi)發(fā)環(huán)境是 VS2015 + C# 6.0 + JS ，代碼僅供參考，請(qǐng)自行修改擴(kuò)展學(xué)習(xí)使用！

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