Why I can't  use my PayPal account to buy the game "The St Christopher's School Lockdown"?

https://classroomgraffiti.itch.io/the-st-christophers-school-lockdown

Hello,

The seller is collecting funds directly into their PayPal account, bypassing us. This can cause compatibility issues if the seller's account isn't compatible with the buyer's. We can help get you in touch with the developer. Contact us at our support email: https://itch.io/support

Thanks