Issue with callback from the paytm payment gateway.

[roshankrm]

Everything works perfectly after deploying on heroku but the payment gateway doesn't work. It says the syntax of callback url is not correct. In the server.js file, the callback url is specified as - paytmParams['CALLBACK_URL'] = 'callback';
I have attached the screenshot of the problem.

I also tried specifying the callback url as '/callback', '' '/callback', 'https://securegw-stage.paytm.in/callback'. None of them worked.

The heroku logs do not show any error either, it is also attached

[programmer-cmyk]

I came across your project and I'm really interested in contributing! I'm familiar with the MERN stack and would love to help develop or improve features. Assign me the task so that i can solve it