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();