Yes, the viewer payment system supports payment through PayPal. This works differently from credit card payment, though, as the player will redirect the viewer to PayPal’s page temporarily to complete payment.
To enable sales over PayPal, you need to first accept the PayPal terms though. To do this, click PREFERENCES and then PAYMENT SETTINGS inside your account.
A button is found that will let you click to “agree to the terms”. After selecting you can turn on “Enable PayPal purchases” which will add the option into your paywall.
There are some exceptions to this, for example if the content might be risque enough to possibly classify as “Blue/Adult”. This type of content is barred from being sold over PayPal.