1,5 year ago, I had once refund request for $700, buyer succed telling PayPal not truth about not delivered item, my documents, conversations, even it was invoice accepted manualy by buyer, nothing helped.
Guess what, my buyers 1,5 year ago had Telegram chat each other to support each other. This guy was contacting my buyers and selling them method for $100, to get $700 back.
Next 3 days I had fraudulent refunds for 5k$
Of course I not paid this, PayPal blocked my account and for that time, debt collecting agency is asking about it constantly and I am inviting PayPal to court.
In whole European Union, PayPal cannot mediate between buyer <> seller and grant refund to anyone, unless it was chargeback. Only court can grant refund.
So if PayPal wants cash from me, let's see in the court, I will smash them in 5 minutes.