EDIT: There may have been issues with the previous jar. I have updated the jar file for this release.
IMPORTANT: There were minor syntax changes in this update, so your code may have to be updated. Due to the new syntax, the documentation and examples have been moved over to wiki pages (https://github.com/APickledWalrus/skript-placeholders/wiki). The latest syntax is available there.
This update allows you to register placeholders using MVdWPlaceholderAPI.
For this to work, you must have an MVdW plugin installed. This also goes for parsing placeholders from MVdWPlaceholderAPI.
The addon also no longer requires PlaceholderAPI and will function if you only have MVdWPlaceholderAPI installed.