diff --git a/backend/internal/payment/provider/wxpay.go b/backend/internal/payment/provider/wxpay.go
index e1b337fc..e6291dd3 100644
--- a/backend/internal/payment/provider/wxpay.go
+++ b/backend/internal/payment/provider/wxpay.go
@@ -60,11 +60,6 @@ const (
 	wxpayEventTransactionSuccess = "TRANSACTION.SUCCESS"
 )
 
-// WeChat Pay error codes.
-const (
-	wxpayErrNoAuth = "NO_AUTH"
-)
-
 var (
 	wxpayNativePrepay = func(ctx context.Context, svc native.NativeApiService, req native.PrepayRequest) (*native.PrepayResponse, *core.APIResult, error) {
 		return svc.Prepay(ctx, req)
diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index a5559b7d..9438542d 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -170,7 +170,7 @@ func (s *AccountTestService) TestAccountConnection(c *gin.Context, accountID int
 
 	// Route to platform-specific test method
 	if account.IsOpenAI() {
-		return s.testOpenAIAccountConnection(c, account, modelID)
+		return s.testOpenAIAccountConnection(c, account, modelID, prompt)
 	}
 
 	if account.IsGemini() {
@@ -410,8 +410,9 @@ func (s *AccountTestService) testBedrockAccountConnection(c *gin.Context, ctx co
 }
 
 // testOpenAIAccountConnection tests an OpenAI account's connection
-func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account *Account, modelID string) error {
+func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account *Account, modelID string, prompt string) error {
 	ctx := c.Request.Context()
+	_ = prompt
 
 	// Default to openai.DefaultTestModel for OpenAI testing
 	testModelID := modelID
diff --git a/backend/internal/service/account_test_service_openai_test.go b/backend/internal/service/account_test_service_openai_test.go
index 82606979..82ff0a8b 100644
--- a/backend/internal/service/account_test_service_openai_test.go
+++ b/backend/internal/service/account_test_service_openai_test.go
@@ -103,7 +103,7 @@ func TestAccountTestService_OpenAISuccessPersistsSnapshotFromHeaders(t *testing.
 		Credentials: map[string]any{"access_token": "test-token"},
 	}
 
-	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4")
+	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "")
 	require.NoError(t, err)
 	require.NotEmpty(t, repo.updatedExtra)
 	require.Equal(t, 42.0, repo.updatedExtra["codex_5h_used_percent"])
@@ -134,7 +134,7 @@ func TestAccountTestService_OpenAI429PersistsSnapshotWithoutRateLimit(t *testing
 		Credentials: map[string]any{"access_token": "test-token"},
 	}
 
-	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4")
+	err := svc.testOpenAIAccountConnection(ctx, account, "gpt-5.4", "")
 	require.Error(t, err)
 	require.NotEmpty(t, repo.updatedExtra)
 	require.Equal(t, 100.0, repo.updatedExtra["codex_5h_used_percent"])