server.js

@@ -173,10 +173,8 @@ app.post('/create-order', async (req, res) => {
                 customer: {
                     first_name: customerData.first_name,
                     last_name: customerData.last_name,
-                    email: customerData.email
-                    // Note: phone is omitted from the customer profile block to prevent Shopify
-                    // "customer.phone_number has already been taken" 400 errors.
-                    // The phone number is still fully stored and used in billing_address and shipping_address.
+                    email: customerData.email,
+                    phone: customerData.phone
                 },
                 billing_address: {
                     first_name: customerData.first_name,