diff --git a/server.ts b/server.ts
index c2ca8cd..542f48e 100644
--- a/server.ts
+++ b/server.ts
@@ -331,6 +331,10 @@ app.post('/api/courses/:id/unlock', authenticateToken, checkoutRateLimiter, asyn
 
   try {
     let customerId = user.asaasCustomerId;
+    const apiKey = AsaasService.getApiKey();
+    if (apiKey && (customerId?.startsWith('cus_sim_') || customerId?.startsWith('cus_fallback_'))) {
+      customerId = null;
+    }
     if (!customerId) {
       customerId = await AsaasService.createCustomer(user.name, user.email);
       user.asaasCustomerId = customerId;
@@ -388,7 +392,7 @@ app.post('/api/courses/:id/unlock', authenticateToken, checkoutRateLimiter, asyn
     res.json({ success: true, payment: newPayment, pixData });
   } catch (err: any) {
     console.error('Course unlock error:', err);
-    res.status(500).json({ error: err.message || 'Erro ao processar pagamento do curso' });
+    res.status(400).json({ error: err.message || 'Erro ao processar pagamento do curso' });
   }
 });
 
@@ -511,6 +515,10 @@ app.post('/api/subscription/subscribe', authenticateToken, async (req: Authentic
 
   try {
     let customerId = user.asaasCustomerId;
+    const apiKey = AsaasService.getApiKey();
+    if (apiKey && (customerId?.startsWith('cus_sim_') || customerId?.startsWith('cus_fallback_'))) {
+      customerId = null;
+    }
     if (!customerId) {
       customerId = await AsaasService.createCustomer(user.name, user.email);
       user.asaasCustomerId = customerId;
@@ -554,7 +562,8 @@ app.post('/api/subscription/subscribe', authenticateToken, async (req: Authentic
       payment: newPayment
     });
   } catch (err: any) {
-    res.status(500).json({ error: err.message || 'Erro ao processar assinatura' });
+    console.error('Subscription error:', err);
+    res.status(400).json({ error: err.message || 'Erro ao processar assinatura' });
   }
 });