Is it advisable to give the callback_url as frontend_url?

In case of any _internet connection loss or any uncertainty_ after the payment has completed isn't it a major problem to have the **call_back url** as the **frontend_url** ? since paytm advises people to use a **S2S** based communication.

please clarify and correct me if I am wrong

Look at the PayTM integration code in the repository, likely in a module like `paytm.py` or `views.py`. Understand how callback URLs are currently configured and the flow for payment completion. Check PayTM's official documentation on S2S (server-to-server) communication versus frontend callbacks to assess the security and reliability implications.

Rédigé par le modèle d'indexation à partir du texte de l'issue.