So when I choose to "Pay" for selected package it redirects me to url.com/?whmcs instead of the url.com/client/?whmcs where it was originally supposed to be.
Until the last moment the address is at url.com/client/?whmcs, but when I click "Pay" it loses the /client/ and makes it show nothing.
Logically I could fix this, but I think its best for you guys to give me a tip what to do.
Yes, in the options I have chosen the default content page as the /client/ page I was talking about.
Awaiting for your feedback.