Do PayPal take a fee?

Excuse me, could you please clarify if PayPal imposes any fees on transactions involving cryptocurrency? It's important for me to understand the costs associated with using PayPal for such transactions, especially if I'm planning to use it for buying or selling digital currencies. Does PayPal charge a flat fee, a percentage of the transaction amount, or both? And are there any additional fees I should be aware of, such as conversion fees or withdrawal charges? Thank you for your assistance in clarifying this matter.