Hey @Purvang_Joshi,
This is really awesome work. I have been trying to integrate Paytm into my app, but only half way there.
what I did was, create a Paytm business account. then used the dashboard to create a set of payment links, 50,100,200,300. ( since all my products are within that range) then attached those links to buttons and make them appear based on what product users selects. this either takes them directly to Paytm website or open the app for direct payment with the amount pre selected.
The only issue i have is gettign the order status back into my google sheet. I dont any experiece with API integration and dont know how to call the API via JSON into the sheet with appscripts. Is there a way you could help me on this? If i can call the api value of transaction ID/Order ID into the sheet, i can match that with the mobile or email user registerted with and credit the amount into the app.