Yup! It works for Citi and Amex cards (no BILT, Capital One, and Chase to my knowledge), maybe a few others. You just log into Paypal -> "Pay My Bills". Allows you to pay off your credit cards using Paypal (select debit card / bank etc) which triggers 0.5% Fold bonus (Fold advertises this as a feature on webpage).

Credit card churning is a fun little hobby of mine and this gets me a nice extra 0.5% bonus.

Just doing the math I realized the ~$500 I made back paying off my student loans is now ~$3k