Can you elaborate on the issue a bit more? Not being able to pay with paypal is a really big deal for non-US customers. Most people in Europe do not have a creditcard for instance.
I would give more information but that's all I know, the paypal pay button has disappeared and as far as I see it is a general problem, I hope it will be solved soon because in my experience, people prefer to pay with paypal in itchio and that affects developers and buyers.
I don't know anything about it, sorry, except that it's a site-wide issue with the connection between itch.io and PayPal. Our admins are working on it, but it's been a few days already.