Fix Tickets.com 505 Error

Whenever I try to check out on any MLB team site that is powered by Tickets.com, I hit a 505 error as soon as the payment page loads. It happens on every team site I’ve tested, and only while I’m logged in to my Tickets.com account... (Budget: $250 - $750 CAD, Jobs: CSS, HTTP, JavaScript, Network Administration, PHP, Troubleshooting, Web Security, WordPress)