refactor: organize service dto contracts

web/src/api/payment.js

@@ -25,6 +25,14 @@ export const refundPaymentOrder = (data) => service({
 })
 
 export const testPaymentProvider = (provider) => service({
+  // The payment test route is registered at /payment/... (without the
+  // frontend /api proxy prefix). When the built UI is opened directly from
+  // the backend port, bypass axios' default /api baseURL for this request
+  // only. Vite/Nginx deployments continue to use the normal proxy path.
+  ...(typeof window !== 'undefined' &&
+  String(window.location.port) === String(import.meta.env.VITE_SERVER_PORT || '8000')
+    ? { baseURL: `${window.location.origin}/` }
+    : {}),
   url: `/payment/providers/${encodeURIComponent(provider)}/test`,
   method: 'post'
 })