Hello,
I made a short test over your website. I found the following error (plase take a look to the screenshot url):
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I think it's a problem related to database connection and/or payment gateway connection. I feel confident on fixing that. I would take bout a day as maximum. I can fix it right away.
My name is Juan Manuel, and although I am new at Freelancer, as you can see I am not new as coder. Please take a look to my (still ongoing) profile.
Regards,
Juan Manuel