Integration Of Paytm Payment Gateway in ReactJS website

I am integrating Paytm Payment Gateway in my ReactJS website using Standard Checkout method of Paytm. The issue is.....When the payment gets completed, the payment gateway has to redirect the user to our website and sends the PaymentResponseParameters to our website in the form of a HiddenHTML form. In my case the payment gets completed(as shown by the Paytm Dashboard) and payment gateway redirects the user to our website page but does not send any data to that page of website.....It shows "CANNOT POST on this URL"......I can't understand whether the PaymentGateway is unable to send the data to my webpage or the webpage is not able to receive the data. Please help.!