fix: enable sdk payment checkout providers

Tiku.Infrastructure/Commerce/WechatPayProvider.cs

@@ -16,10 +16,7 @@ internal sealed class WechatPayProvider : IPaymentProvider
         CreatePaymentProviderRequest request,
         CancellationToken cancellationToken = default)
     {
-        _ = BuildClient(account);
-        throw new PaymentProviderException(
-            "WeChat Pay SDK is configured; checkout call is enabled in the commerce checkout batch.",
-            "wechat_pay_checkout_not_enabled");
+        return CreatePaymentCoreAsync(account, request, cancellationToken);
     }
 
     public Task<PaymentNotificationResult> ParsePaymentNotificationAsync(
@@ -73,6 +70,59 @@ internal sealed class WechatPayProvider : IPaymentProvider
         return WechatTenpayClientBuilder.Create(options).Build();
     }
 
+    private async Task<CreatePaymentProviderResult> CreatePaymentCoreAsync(
+        PaymentProviderAccount account,
+        CreatePaymentProviderRequest request,
+        CancellationToken cancellationToken)
+    {
+        if (string.IsNullOrWhiteSpace(request.OpenId))
+        {
+            throw new PaymentProviderException("WeChat Pay JSAPI requires openId.", "wechat_pay_openid_required");
+        }
+
+        var client = BuildClient(account);
+        var appId = Required(account.ConfigPublic, "appId");
+        var wxRequest = new CreatePayTransactionJsapiRequest
+        {
+            AppId = appId,
+            Description = request.Subject,
+            OutTradeNumber = request.OrderNo,
+            NotifyUrl = request.NotifyUrl,
+            Amount = new CreatePayTransactionJsapiRequest.Types.Amount
+            {
+                Total = request.AmountCents
+            },
+            Payer = new CreatePayTransactionJsapiRequest.Types.Payer
+            {
+                OpenId = request.OpenId
+            }
+        };
+        var response = await client.ExecuteCreatePayTransactionJsapiAsync(wxRequest, cancellationToken);
+        if (!response.IsSuccessful())
+        {
+            throw new PaymentProviderException(
+                $"WeChat Pay create transaction failed: {response.ErrorCode}",
+                "wechat_pay_create_failed");
+        }
+
+        var clientPayload = JsonSerializer.SerializeToElement(
+            client.GenerateParametersForJsapiPayRequest(appId, response.PrepayId));
+        var rawPayload = JsonSerializer.SerializeToElement(new
+        {
+            response.PrepayId,
+            request.OrderNo,
+            request.AmountCents
+        });
+
+        return new CreatePaymentProviderResult(
+            Provider,
+            request.Method,
+            "pending",
+            null,
+            clientPayload,
+            rawPayload);
+    }
+
     private static string Required(JsonElement element, params string[] keys)
     {
         if (element.ValueKind == JsonValueKind.Object)