payumoney extension not working pls help

[shivopticals]

i have bought and installed payumoney extension but it is not working

on check out it is showing this error
((((The page isn't redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

    This problem can sometimes be caused by disabling or refusing to accept cookies.))

how to solve this

my webaddress is: shivopticals.byethost18.com/

[Basara]

Hello.

Please contact payumoney extension developer. Go to page where you buy it and write comment to developer