diff --git a/server/routes/checkout.js b/server/routes/checkout.js
index 28270f9..240ce75 100644
--- a/server/routes/checkout.js
+++ b/server/routes/checkout.js
@@ -47,10 +47,14 @@ router.post('/create-session', async (req, res) => {
       return res.status(400).json({ error: 'Invalid tons value' });
     }
 
-    if (!portfolioId || ![1, 2, 3].includes(portfolioId)) {
+    // Accept any valid positive integer portfolio ID (from Wren API)
+    if (!portfolioId || !Number.isInteger(portfolioId) || portfolioId <= 0) {
+      console.error('❌ Invalid portfolio ID received:', portfolioId);
       return res.status(400).json({ error: 'Invalid portfolio ID' });
     }
 
+    console.log(`📦 Creating checkout for portfolio ID: ${portfolioId}, tons: ${tons}`);
+
     // Calculate pricing
     const { baseAmount, processingFee, totalAmount, pricePerTon } = calculatePricing(tons, portfolioId);