Looks like the transaction gateway is forever down. I first tried it a few weeks ago with CC, and the payment succeeded at the PayU gateway, but, failed when sending a response to uidai - transaction times out at residentpvc.uidai.gov.in. Transaction was finally refunded (I think automatically yesterday) - I had given up on their support after my first attempt at reaching out to them at their help email id.
Tried again yesterday via CC and Netbanking. Both times, it succeeds at the PayU gateway, but fails when sending the response to residentpvc.uidai.gov.in
Anybody have any luck with this of late?