Trying to put some money in my GoG wallet but after I log onto Paypal the mini-window shows a "Things don't appear to be working at the moment" error and says "Please try again." (I can log onto Paypal via the main browser window without issue, but this error still shows up when I click the "Pay with Paypal" button) At the moment Paypal's the only option that works for me (don't have a Paysafecard card, I don't know enough about skrill or webmoney to trust them, and the latter's not an option in the US anyways) so this is kinda a big deal.

Anyone else getting this error?

I would try waiting for a while and seeing if it works later.

Paypal was having problems around that time.
It happened to me on Humble and Downdetector had reports of problems.

https://downdetector.com/status/paypal/

Issue fixed itself. XD

Paypal seems to be having a lot of problems as of late...