Hi @radjr (& others),
I’ve reviewed the settings and done some testing and I’m happy to report that OJS 3.1.2-1 does support pay-per-view! There is one cosmetic issue that you may want to patch ([OJS 3.1.1] Article button doesn't change style in case of login - #5 by asmecher) – a fix is available there, and will be fixed in the next release of OJS.
Regards,
Alec Smecher
Public Knowledge Project Team