fix: retrieve PromptPay QR code URL from scannable_code.image.download_uri

apps/backend/src/routes/payments.ts

@@ -124,8 +124,8 @@ export const paymentsRoute = new Elysia({ prefix: "/payments" })
           return { error: charge.message || "Failed to create PromptPay charge" };
         }
 
-        // Get QR Code Image URL from the charge's source references
+                // Get QR Code Image URL from scannable_code or references
-        const qrCodeUrl = charge.source?.references?.barcode || null;
+        const qrCodeUrl = charge.source?.scannable_code?.image?.download_uri || charge.source?.references?.barcode || null;
 
         return {
           success: true,