This is most unusual. I placed an order yesterday evening your time and my payment via Paypal was not accepted.
As you can see I'm a longstanding customer so I'd like you to correct this so my Paypal payment is accepted. There's as far as I can recall not been an issue in the past.
With kind regards, Guy Goodall
PS. I used the "Contact us" form and got this message
Fatal error: Cannot pass parameter 2 by reference in /home/admin/stackideas.com/components/com_billings/views/contactus/view.html.php on line 62
Hope this helps