Who pays the PayPal fee?

Could you please clarify who is responsible for covering the PayPal fee in this transaction? Is it the buyer, the seller, or is there a shared responsibility arrangement in place? I'm seeking a definitive answer to ensure all parties are aware of their financial obligations and avoid any potential misunderstandings or disputes during the payment process. Additionally, are there any factors that could impact who pays the fee, such as the transaction amount or the buyer's and seller's location? Thank you for your time and consideration.