A few weeks later, I started getting emails and calls almost daily about past due payments for my PayPal balance, which I was confused about since I used my own funds and thought that was the end of it. Turns out, PayPal charged that $300 to my credit account with them instead of taking it out of my balance, so now I owed an extra $300 and had to pay interest and late payment fees. When I called in to customer service to ask what was going on, it took me almost an hour to finally reach someone and they told me there was nothing they could do.
After that, I paid my remaining balance, closed my account and never looked back. I've since used Venmo, Square, bank transfers, and good ol cash to accept payments from friends, but I will NEVER use PayPal again in my life. Fuck them.