PAPI placeholders are now handled internally and only enabled if PAPI is on the server. The placeholder values are the same so you shouldn't need to change anything if you're updating from previous version. Just delete the expansion from the placeholderapi expansion folder.

Double checked that the plugin functions correctly on the newest versions of spigot.

Also, I did a complete rewrite to update the code to my new more experienced way of doing things which you don't care about