DotNetCore.SKIT.FlurlHttpCl.../docs/WechatTenpayV3/Basic_GlobalAPI.md

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## 如何接入境外支付 API
微信支付境外支付 API 的接入点、接口模型公共参数等配置项与基础 API 完全不同,需要使用独立的扩展客户端。
```csharp
using SKIT.FlurlHttpClient.Wechat.TenpayV3.ExtendedSDK.Global;
using SKIT.FlurlHttpClient.Wechat.TenpayV3.Settings;
var manager = new InMemoryCertificateManager();
var options = new WechatTenpayGlobalClientOptions()
{
MerchantId = "微信商户号",
MerchantV3Secret = "微信商户 v3 API 密钥",
MerchantCertificateSerialNumber = "微信商户证书序列号",
MerchantCertificatePrivateKey = System.IO.File.ReadAllText("/微信商户证书私钥文件路径/apiclient_key.pem"),
PlatformCertificateManager = manager
};
var client = WechatTenpayGlobalClientBuilder.Create(options).Build();
```
该扩展客户端在用法上基础客户端完全相同,只需引入相应的命名空间即可。