Thanks for looking into it.
When i tried "pay at hotel"
View attachment 5033
Then tried "pay online". For me, the side menu was not showing.
View attachment 5034
When i tried "Add new card"
View attachment 5035
Since it worked for you, i tried in a different browser. I got the option to pay via Tata Pay App(not the other options) (probably because this was tata neu festive offer)
View attachment 5036
This worked and I was able to pay via Neu Rupay cc