Myself and my guests can no longer access our wedding website at
http://owenandlara.com. It should be displaying the PIN prompt, but instead the dev tools console shows a 500 server error, and the page only contains the text 'api proxy'. Our guests can no longer RSVP to our wedding and we have already received complaints.

This needs to be fixed as soon as possible. I hope you guys aren't testing on your production environment.
Re: 500 server error and 'api proxy' text when trying to reach our wedding website
Please fix as soon as possible.
I'm so sorry you were experiencing this. Is this still occurring for you? Were you seeing this before or after entering your PIN?
I am going to forward your info to our tech team so they can investigate. (In the interest of protecting your privacy, I've removed your wedding website link from your original post.)
Thank you!
KH
I've encountered it both when visiting the site with empty cache and cookies cleared, expecting to see the PIN prompt, and I've also seen it when visiting the site having entered a PIN before.
I'm also getting javascript errors on Chrome v46.0.2490.86m when I can successfully access the site: