用c#和ASP实现PayPal智能按钮的客户端/服务器。网络核心

源代码

学习成果

如何建立PayPal商业账户。
如何为沙箱获取API凭据——即客户端ID和秘密。
如何获取实时的API凭证——例如客户端ID和Secret。
数据存储中的字段。
服务器端代码。

先决条件

您已经为您的电子商务网站注册了一个URL，例如，www.delaneys.space。
网站使用SSL证书进行保护。
您的客户可以注册和登录到您的网站在一个安全的方式使用OAuth或一些过度安全的方法。
你的网站有一个后台数据存储，你知道如何维护它。
你对Visual Studio很熟悉。

用下面的行标题创建一个电子表格:

1仪表板url https://www.paypal.com/mep/dashboard2开发者仪表板url https://developer.paypal.com/developer/applications3沙箱细节 4 url www.sandbox.paypal.com/5 app名称6业务7用户名……@business.example.com8密码,9客户端id10的秘密,11个人(顾客)12个用户名…@personal.example.com13个密码,14个生活细节 ,15个用户名info@……16个密码,17 app名称18客户id19个秘密,

创建一个PayPal业务帐户

要创建一个PayPal商业账户，你不需要拥有自己的企业或商业银行账户。不过，你应该采取措施，把你的个人金融交易与电子商务网站的交易分开。因此，我建议使用一个单独的个人银行账户连接到你的PayPal业务账户。

导航到www.PayPal.com。点击注册，即使你已经有一个个人贝宝帐户。记住永远不要把工作和娱乐混为一谈。选择业务帐户并单击Next。完成简短的问卷对于“我想主要接受付款”的问题，选择“On my website”。选择问题“May annual volume is:”的答案。

提供一个电子邮件地址并单击Continue。这可以是任何有效的电子邮件地址，但你可能想使用“info@youre-commerce.com”。提供密码并单击Continue。确认电子邮件将发送到所提供的地址。更新你的电子表格。 15个用户名info@……16个密码, 完成业务联系细节页面，点击同意和创建帐户。他们会要求你的联系人姓名，企业名称，电话号码和企业地址。选择业务类型从个人、独资、合伙、私人公司、上市公司、非营利组织、政府实体、信托投资和家庭的列表中选择。添加个人信息。包括你的姓名、出生日期和地址。单击Submit。您现在已经建立了您的PayPal业务帐户。您将看到一个仪表板显示。

获取API凭证——即客户端ID和秘密

进入开发人员控制面板: 2开发者仪表板url https://developer.paypal.com/developer/applications 沙箱选项将被预先选中。我们先来设置它。单击“创建应用”。创建一个沙箱应用名称并存储在电子表格中。 17 app名称再次单击Create App。更新以下电子表格: 6业务7用户名…@business.example.com , 9客户端id10的秘密, 现在让我们获取密码。点击沙箱|帐户按钮或(developer.paypal.com/developer/accounts/)。您应该看到两个电子邮件地址表示一个企业帐户和个人帐户。点击业务账户的…按钮，选择查看/编辑账户。在电子表格中记录系统生成的密码。 8密码, 单击Close。点击个人帐户的…按钮，选择查看/编辑帐户。在电子表格中记录用户名和密码。 11个人(顾客)12个用户名……@personal.example.com 13密码 |0>>>>;

为Live获取API凭据

点击我的应用程序&凭证(developer.paypal.com/developer/applications/)。单击Live按钮。单击Create App。在电子表格中记录应用程序名称。 17 app名称点击创建App(再次)。在电子表格中记录客户ID和secret。 18客户id19个秘密,

要向数据存储添加哪些字段

选择一个数据存储，比如SQL Servers。你需要一个篮子，项目和发票模型/核心类。将以下蓝色突出显示的字段添加到您的发票表中。这些字段将被贝宝使用。

注意，FirstName、LastName和Email存储在用户表中，但是也复制在Invoice表中。这是因为来自客户PayPal账户的数据可能与用户表中的数据不同。由您决定如何在数据存储中包括蓝色字段。

服务器端代码

Create an ASP.NET Core 3.x MVC application using Visual Studio.
Go to NuGet package manager and add the following packages:
- PayPalCheckoutSdk, package version 1.0.3. I used the latest version at the time of writing.
  
  PayPalCheckoutSdk is merely a class library. There is no logic contained within the library. The classes are decorated with attributes to aid the serialisation into JSON.
- PayPalHttp v1.0.0.
- Microsoft.AspNetCore.Mvc.NewtonsoftJson. With the release of ASP.NET Core 3.0 Microsoft broke their implementation of JSON serialisation. Search for "ASP.NET Core: Blank Json {} Return After Upgrading to 3.0" to find out what to add to Startup.ConfigureServices or choose an option from the next step.

Update Startup.ConfigureServices to call AddNewtonsoftJson.

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services.AddMvc()
        .AddNewtonsoftJson();

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services.AddMvc()
        .AddNewtonsoftJson(options =>
                           options.SerializerSettings.ContractResolver =
                           new CamelCasePropertyNamesContractResolver());

Create a folder called PayPal in your ASP.NET Core project.

Create a class PayPalClient in the folder, with the code below.
Remember to use the sandbox and live client Ids and secrets to populate the highlighted string content.

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using System;
using PayPalCheckoutSdk.Core;

using System.IO;
using System.Text;
using System.Runtime.Serialization.Json;

namespace PayPal
{
    public class PayPalClient
    {
        // Place these static properties into a settings area.
        public static string SandboxClientId { get; set; } = "<alert>{PayPal SANDBOX Client Id}</alert>";
        public static string SandboxClientSecret { get; set; } = "<alert>{PayPal SANDBOX Client Secret}</alert>";

        public static string LiveClientId { get; set; } = "<alert>{PayPal LIVE Client Id}</alert>";
        public static string LiveClientSecret { get; set; } = "<alert>{PayPal LIVE Client Secret}</alert>";

        ///<summary>
        /// Set up PayPal environment with sandbox credentials.
        /// In production, use LiveEnvironment.
        ///</summary>
        public static PayPalEnvironment Environment()
        {
#if DEBUG
            // You may want to create a UAT (user exceptance tester) role and check for this:
            // "if(_unitOfWork.IsUATTester(GetUserId())" instead of fcomiler directives.
            return new SandboxEnvironment(<alert>SandboxClientId</alert>,
                                          <alert>SandboxClientSecret</alert>);
#else
            return new LiveEnvironment(<alert>LiveClientId</alert>, 
                                       <alert>LiveClientSecret</alert>);
#endif
        }

        ///<summary>
        /// Returns PayPalHttpClient instance to invoke PayPal APIs.
        ///</summary>
        public static PayPalCheckoutSdk.Core.PayPalHttpClient Client()
        {
            return new PayPalHttpClient(Environment());
        }

        public static PayPalCheckoutSdk.Core.PayPalHttpClient Client(string refreshToken)
        {
            return new PayPalHttpClient(Environment(), refreshToken);
        }

        
        ///<summary>
        /// Use this method to serialize Object to a JSON string.
        ///</summary>
        public static String ObjectToJSONString(Object serializableObject)
        {
            MemoryStream memoryStream = new MemoryStream();
            var writer = JsonReaderWriterFactory.CreateJsonWriter(memoryStream,
                                                                  Encoding.UTF8,
                                                                  true,
                                                                  true,
                                                                  "  ");

            var ser = new DataContractJsonSerializer(serializableObject.GetType(),
                                                     new DataContractJsonSerializerSettings 
                                                     {
                                                         UseSimpleDictionaryFormat = true 
                                                     });

            ser.WriteObject(writer,
                            serializableObject);

            memoryStream.Position = 0;
            StreamReader sr = new StreamReader(memoryStream);

            return sr.ReadToEnd();
        }
    }
}

Create a class SmartButtonHttpResponse in the folder, with code.

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using System.Net;
using System.Net.Http.Headers;

namespace PayPal
{
    public class SmartButtonHttpResponse
    {
        readonly PayPalCheckoutSdk.Orders.Order _result;
        public SmartButtonHttpResponse(PayPalHttp.HttpResponse httpResponse)
        {
            Headers = httpResponse.Headers;
            StatusCode = httpResponse.StatusCode;
            _result = httpResponse.Result<PayPalCheckoutSdk.Orders.Order>();
        }

        public HttpHeaders Headers { get; }
        public HttpStatusCode StatusCode { get; }

        public PayPalCheckoutSdk.Orders.Order Result()
        {
            return _result;
        }

        public string orderID { get; set; }
    }
}

Create a class OrderBuilder in the folder, with code.

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using PayPalCheckoutSdk.Orders;
using System.Collections.Generic;

namespace PayPal
{
    public static class OrderBuilder
    {
        /// <summary>
        /// Use classes from the PayPalCheckoutSdk to build an OrderRequest
        /// </summary>
        /// <returns></returns>
        public static OrderRequest Build()
        {
            OrderRequest orderRequest = new OrderRequest();
            
            // Add code to fill out the order request properties
            <alert>// See the attached source code for a more detailed example.</alert> 

            return orderRequest;
        }
    }
}

Create a controller class in the Controllers folder called CheckoutController. Add the following code.

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using Microsoft.AspNetCore.Mvc;
using System.Threading.Tasks;

using PayPalCheckoutSdk.Orders;

namespace Test.Controllers
{
    public class CheckoutController : Controller
    {
        /// <summary>
        /// Action to display the cart form for the SERVER side intergration
        /// </summary>
        /// <returns></returns>
        public IActionResult Index()
        {
#if DEBUG
            // You may want to create a UAT (user exceptance tester) role and check for this:
            // "if(_unitOfWork.IsUATTester(GetUserId())"
            // Company SANDBOX Client Id. To go live replace this with the live ID.
            ViewBag.ClientId = <alert>PayPal.PayPalClient.SandboxClientId</alert>; // Get from a data store or stettings
#else
            // Company LIVE Client Id. To go live replace this with the live ID.
            ViewBag.ClientId = <alert>PayPal.PayPalClient.LiveClientId</alert>; // Get from a data store or stettings
#endif

            ViewBag.CurrencyCode = "GBP"; // Get from a data store
            ViewBag.CurrencySign = "£";   // Get from a data store

            return View();
        }

        /// <summary>
        /// This action is called when the user clicks on the PayPal button.
        /// </summary>
        /// <returns></returns>
        [Route("api/paypal/checkout/order/create")]
        public async Task<PayPal.SmartButtonHttpResponse> Create()
        {
            var request = new PayPalCheckoutSdk.Orders.OrdersCreateRequest();

            request.Prefer("return=representation");
            request.RequestBody(PayPal.OrderBuilder.Build());
            
            // Call PayPal to set up a transaction
            var response = await PayPal.PayPalClient.Client().Execute(request);
            
            // Create a response, with an order id.
            var result = response.Result<PayPalCheckoutSdk.Orders.Order>();
            var payPalHttpResponse = new PayPal.SmartButtonHttpResponse(response)
            {
                orderID = result.Id
            };
            return payPalHttpResponse;
        }


        /// <summary>
        /// This action is called once the PayPal transaction is approved
        /// </summary>
        /// <paramname="orderId"></param>
        /// <returns></returns>
        [Route("api/paypal/checkout/order/approved/{orderId}")]
        public IActionResult Approved(string orderId)
        {
            return Ok();
        }


        /// <summary>
        /// This action is called once the PayPal transaction is complete
        /// </summary>
        /// <paramname="orderId"></param>
        /// <returns></returns>
        [Route("api/paypal/checkout/order/complete/{orderId}")]
        public IActionResult Complete(string orderId)
        {
            // 1. Update the database.
            // 2. Complete the order process. Create and send invoices etc.
            // 3. Complete the shipping process.
            return Ok();
        }


        /// <summary>
        /// This action is called once the PayPal transaction is complete
        /// </summary>
        /// <paramname="orderId"></param>
        /// <returns></returns>
        [Route("api/paypal/checkout/order/cancel/{orderId}")]
        public IActionResult Cancel(string orderId)
        {
            // 1. Remove the orderId from the database.
            return Ok();
        }


        /// <summary>
        /// This action is called once the PayPal transaction is complete
        /// </summary>
        /// <paramname="orderId"></param>
        /// <returns></returns>
        [Route("api/paypal/checkout/order/error/{orderId}/{error}")]
        public IActionResult Error(string orderId,
                                   string error)
        {
            // Log the error.
            // Notify the user.
            return NoContent();
        }
    }
}

Create a Checkout folder in the Views folder and add a view called index.cshtml

Add the following code to create the PayPal smart button to the view.

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<!-- Set up a container element for the PayPal smart button -->
<divid="paypal-button-container"></div>

<!-- Include the PayPal JavaScript SDK -->
<scriptsrc="https://www.paypal.com/sdk/js?client-id=@ViewBag.ClientId&currency=@ViewBag.CurrencyCode"></script>

<script>

    // This is stored just in case the user cancels the other 
    // or there is an error in the other process.
    var orderId;
    // Render the PayPal smart button into #paypal-button-container
    paypal.Buttons({

        // Set up the transaction
        createOrder: function (data, actions) {
            orderId = data.orderID;
            return fetch('/api/paypal/checkout/order/create/', {
                method: 'post'
            }).then(function (res) {
                return res.json();
            }).then(function (data) {
                return data.orderID;
            });
        },

        // Finalise the transaction
        onApprove: function (data, actions) {
            return fetch('/api/paypal/checkout/order/approved/' + data.orderID, {
                method: 'post'
            }).then(function (res) {
                return actions.order.capture();
            }).then(function (details) {

                // (Preferred) Notify the server that the transaction id complete and have a option to display an order completed screen.
                window.location.replace('/api/paypal/checkout/order/complete/' + data.orderID + '/@ViewBag.CurrencyCode');
                
                // OR
                // Notify the server that the transaction id complete
                //httpGet('/api/paypal/checkout/order/complete/' + data.orderID);

                // Show a success message to the buyer
                alert('Transaction completed by ' + details.payer.name.given_name + '!');
            });
        },

        // Buyer cancelled the payment
        onCancel: function (data, actions) {
            httpGet('/api/paypal/checkout/order/cancel/' + data.orderID);
        },

        // An error occurred during the transaction
        onError: function (err) {
            httpGet('/api/paypal/checkout/order/error/' + orderId + '/' + encodeURIComponent(err));
        }

    }).render('#paypal-button-container');
</script>

Apart from the URLs, this code is the same for all solutions.

Add the following JavaScript function:

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function httpGet(url) {
    var xmlHttp = new XMLHttpRequest();
    xmlHttp.open("GET", url, false);
    xmlHttp.send(null);
    return xmlHttp.responseText;
}

Create a folder called Values within the PayPal folder.

Add a class called CheckoutPaymentIntent.cs, within the Values folder.
Add the following code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PayPal.Values
{
    /// <summary>
    /// The intent to either capture payment immediately or
    /// authorize a payment for an order after order creation.
    /// </summary>
    public static class CheckoutPaymentIntent
    {

        /// <summary>
        /// The merchant intends to capture payment immediately after the customer makes a payment.
        /// </summary>
        public static string CAPTURE { get; private set; } = "CAPTURE";

        /// <summary>
        /// The merchant intends to authorize a payment and
        /// place funds on hold after the customer makes a payment.
        /// Authorized payments are guaranteed for up to three days but
        /// are available to capture for up to 29 days.
        /// After the three-day honor period, the original authorized payment expires
        /// and you must re-authorize the payment.
        /// You must make a separate request to capture payments on demand.
        /// This intent is not supported when you have more than one `purchase_unit` within your order.
        /// </summary>
        public static string AUTHORIZE { get; private set; } = "AUTHORIZE";
    }
}

Add a class called CurrencyCode.cs, within the Values folder.
Add the following code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PayPal.Values
{
    public static class CurrencyCode
    {

        /// <summary>
        /// Great British Pounds
        /// </summary>
        public static string GBP { get; private set; } = "GBP";

        /// <summary>
        /// US Dolars
        /// </summary>
        public static string USD { get; private set; } = "USD";

        /// <summary>
        /// Euros
        /// </summary>
        public static string EUR { get; private set; } = "EUR";
    }
}

Add additional currencies, as required.

Add a class called LandingPage.cs, within the Values folder.
Add the following code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PayPal.Values
{
    /// <summary>
    /// The type of landing page to show on the PayPal site for customer checkout.
    /// Default: NO_PREFERENCE.
    /// Source: https://developer.paypal.com/docs/api/orders/v2/
    /// </summary>
    public class LandingPage
    {
        /// <summary>
        /// When the customer clicks PayPal Checkout, the customer is redirected to a page to log in to PayPal and approve the payment.
        /// </summary>
        public static string LOGIN { get; private set; } = "LOGIN";

        /// <summary>
        /// When the customer clicks PayPal Checkout, 
        /// the customer is redirected to a page to enter credit or 
        /// debit card and other relevant billing information required to complete the purchase.
        /// </summary>
        public static string BILLING { get; private set; } = "BILLING";

        /// <summary>
        /// When the customer clicks PayPal Checkout,
        /// the customer is redirected to either a page to log in to PayPal and
        /// approve the payment or to a page to enter credit or
        /// debit card and other relevant billing information
        /// required to complete the purchase, depending on their previous interaction with PayPal.
        /// </summary>
        public static string NO_PREFERENCE { get; private set; } = "NO_PREFERENCE";
    }
}

Add a class called ShippingPreference.cs, within the Values folder.
Add the following code.

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namespace PayPal.Values
{
    /// <summary>
    /// The shipping preference:
    ///    /// * Displays the shipping address to the customer.
    /// * Enables the customer to choose an address on the PayPal site.
    /// * Restricts the customer from changing the address during the payment-approval process.
    ///    /// Default: GET_FROM_FILE.
    /// Source: https://developer.paypal.com/docs/api/orders/v2/
    /// </summary>
    public static class ShippingPreference
    {
        /// <summary>
        /// Use the customer-provided shipping address on the PayPal site.
        /// </summary>
        public static string GET_FROM_FILE { get; private set; } = "GET_FROM_FILE";

        /// <summary>
        /// Redact the shipping address from the PayPal site. Recommended for digital goods.
        /// </summary>
        public static string NO_SHIPPING { get; private set; } = "NO_SHIPPING";

        /// <summary>
        /// Use the merchant-provided address. The customer cannot change this address on the PayPal site.
        /// </summary>
        public static string SET_PROVIDED_ADDRESS { get; private set; } = "SET_PROVIDED_ADDRESS";
    }
}

Add a class called UserAction.cs, within the Values folder.
Add the following code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PayPal.Values
{
    /// <summary>
    /// Configures a Continue or Pay Now checkout flow.
    /// Source: https://developer.paypal.com/docs/api/orders/v2/
    /// </summary>
    public static class UserAction
    {

        /// <summary>
        /// After you redirect the customer to the PayPal payment page,
        /// a Continue button appears. Use this option when the final amount is not known
        /// when the checkout flow is initiated and you want to redirect
        /// the customer to the merchant page without processing the payment.
        /// </summary>
        public static string CONTINUE { get; private set; } = "CONTINUE";

        /// <summary>
        /// After you redirect the customer to the PayPal payment page,
        /// a Pay Now button appears.
        /// Use this option when the final amount is known when the checkout is initiated
        /// and you want to process the payment immediately when the customer clicks Pay Now.
        /// </summary>
        public static string PAY_NOW { get; private set; } = "PAY_NOW";
    }
}

Create a folder called Item within the PayPal\Values folder.

Add a class called Category.cs, within the Values folder.
Add the following code.

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace PayPal.Values.Item
{
    /// <summary>
    /// The item category type.
    /// </summary>
    public static class Category
    {

        /// <summary>
        /// Goods that are stored, delivered, and
        /// used in their electronic format.
        /// This value is not currently supported for API callers that leverage the
        /// [PayPal for Commerce Platform](https://www.paypal.com/us/webapps/mpp/commerce-platform) product.
        /// </summary>
        public static string DIGITAL_GOODS { get; private set; } = "DIGITAL_GOODS";

        /// <summary>
        /// A tangible item that can be shipped with proof of delivery.
        /// </summary>
        public static string PHYSICAL_GOODS { get; private set; } = "PHYSICAL_GOODS";
    }
}

The final step is to write code to handle what happens when the following code is called:
- api/paypal/checkout/order/create
- api/paypal/checkout/order/approved/{orderId}
- api/paypal/checkout/order/complete/{orderId}
- api/paypal/checkout/order/cancel/{orderId}
- api/paypal/checkout/order/error/{orderId}/{error}
Good Luck.

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posted @ 2020-08-12 21:36 Dincat 阅读(266) 评论(0) 收藏举报

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Dincat

用c#和ASP实现PayPal智能按钮的客户端/服务器。网络核心

源代码

学习成果

先决条件

用下面的行标题创建一个电子表格:

创建一个PayPal业务帐户

获取API凭证——即客户端ID和秘密

为Live获取API凭据

要向数据存储添加哪些字段

服务器端代码

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