如何在 asp.net core 3.0 中正确实施 PayPal 支付答案

【问题标题】：How do I properly implement PayPal payment in asp.net core 3.0如何在 asp.net core 3.0 中正确实施 PayPal 支付
【发布时间】：2019-06-12 12:59:30
【问题描述】：

因此，我正在尝试使用我的沙盒帐户实施 PayPal 付款方式进行测试，并且我能找到的所有文档都适用于仍然使用 AppConfig 和/或 Webconfig 的 ASP.NET Core 版本。我只有 appsettings.json，所以我不知道如何在这里实现这部分

<configuration>
  <configSections>
    <section name="paypal" type="PayPal.SDKConfigHandler, PayPal" />
  </configSections>

  <!-- PayPal SDK settings -->
  <paypal>
    <settings>
      <add name="mode" value="sandbox" />
      <add name="clientId" value="__CLIENT_ID__" />
      <add name="clientSecret" value="__CLIENT_SECRET__" />
    </settings>
  </paypal>
</configuration>

显示在他们的GitHub page

我尝试将其添加到我的 appsettings.json

  "PayPal": {
    "mode": "sandbox",
    "clientId": "xxxx",
    "clientSecret": "xxxx"
  }

然后这个

// Get a reference to the config
            var config = ConfigManager.Instance.GetProperties();

            // Use OAuthTokenCredential to request an access token from PayPal
            var accessToken = new OAuthTokenCredential(config).GetAccessToken();

            var apiContext = new APIContext(accessToken);

            var payment = Payment.Get(apiContext, "PAY-0XL713371A312273YKE2GCNI");

这引发了我这个异常

FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

抛出它的那一行是var config = ConfigManager.Instance.GetProperties();

【问题讨论】：

标签： asp.net razor asp.net-core paypal

【解决方案1】：

仅适用于 Asp.net 核心

快速总结：将 PayPal SDK 提供的config 替换为自定义的

将 PayPal 部分添加到 appsettings.json 文件

例如

"paypal": {
  "settings": {
    "business": "your_business_email@provider.ext",
    "mode": "sandbox",
    "merchantId": "MERCHANT_ID",
    "clientId": "CLIENT_ID",
    "clientSecret": "CLIENT_SECRET"
  }
},

在你希望调用paypal的GetAccessToken方法的类中，确保您

声明对Microsoft.Extensions.Configuration的依赖即
```
using Microsoft.Extensions.Configuration;
```

在类构造函数中，添加一个参数IConfiguration config，它将由asp.net的DI提供，即

class PayPalHandler{

 public PayPalHandler(IConfiguration config){

 }
}

在var accessToken = new OAuthTokenCredential(config).GetAccessToken();，我们将替换 config 由 Paypal 提供 ConfigManager.Instance.GetProperties();我们自己的

定义我们自己的配置以传递给 PayPal

using PayPal.Api;
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
class PayPalHandler{
  
  //@ Declare a R/O property to store our own custom configuration for PayPal
  private readonly Dictionary<string,string> _payPalConfig;

  //@ The class constructor
  public PayPalHandler(IConfiguration config){

    //@ Fetch the `appsettings.json` and pack it into the custom configuration
    //@ Only the *clientId*,*clientSecret* and *mode* are required to get an access token (as of the time of writing this)
    _payPalConfig = new Dictionary<string, string>()
    {
        { "clientId" , config.GetSection("paypal:settings:clientId").Value },
        { "clientSecret", config.GetSection("paypal:settings:clientSecret").Value },
        { "mode", config.GetSection("paypal:settings:mode").Value },
        { "business", config.GetSection("paypal:settings:business").Value },
        { "merchantId", config.GetSection("paypal:settings:merchantId").Value },
    };

  }
}

使用 OAuthTokenCredential 通过我们的自定义配置从 PayPal 请求访问令牌

var accessToken = new OAuthTokenCredential(_payPalConfig).GetAccessToken();

完整的实现应该类似于

using PayPal.Api;
using System.Collections.Generic;
using Microsoft.Extensions.Configuration;
class PayPalHandler{
  
  //@ Declare a R/O property to store our own custom configuration for PayPal
  private readonly Dictionary<string,string> _payPalConfig;

  //@ The class constructor
  public PayPalHandler(IConfiguration config){

    //@ Fetch the `appsettings.json` and pack it into the custom configuration
    //@ Only the *clientId*,*clientSecret* and *mode* are required to get an access token (as of the time of writing this)
    _payPalConfig = new Dictionary<string, string>()
    {
        { "clientId" , config.GetSection("paypal:settings:clientId").Value },
        { "clientSecret", config.GetSection("paypal:settings:clientSecret").Value },
        { "mode", config.GetSection("paypal:settings:mode").Value },
        { "business", config.GetSection("paypal:settings:business").Value },
        { "merchantId", config.GetSection("paypal:settings:merchantId").Value },
    };

    //@ Use OAuthTokenCredential to request an access token from PayPal using our custom configuration
    var accessToken = new OAuthTokenCredential(_payPalConfig).GetAccessToken();

    //@ Proceed as desired 

  }
}

【讨论】：

【解决方案2】：

为了访问配置属性添加到ConfigureServices:

services.Configure<PayPal>(Configuration.GetSection("PayPal"));

您可以在其中使用 appsettings 文件中的属性创建一个名为 PayPal 的新类。

然后你可以通过

注入到控制器中

IOptions<PayPal> paypalOptions

【讨论】：