If you’re going to donate, please don’t take it back on paypal. Only donate if you’re absolutely positive if you can.
I’ve got a negative account balance now because someone took back money that I had already used to buy myself dinner.
The only reason I have a donation button is if people have a few dollars and I entertain them, they have the opportunity to throw me a few bucks. It’s in no way required, and I never even talk about it. So please, only donate if you’re not going to take it back.