Staff-Core

Spigot overview: https://www.spigotmc.org/resources/staff-core.82324/

Implement the API: Maven:

Option 1:

<dependency>
  <groupId>cl.bebt.staffcore</groupId>
  <artifactId>staffcore</artifactId>
  <version>4.4.6</version>
</dependency>

Option 2:

Step 1.

<repositories>
	<repository>
	    <id>jitpack.io</id>
	    <url>https://jitpack.io</url>
	</repository>
</repositories>

Step 2. Add the dependency

<dependency>
    <groupId>com.github.BarraR3port</groupId>
    <artifactId>staffcore</artifactId>
    <version>4.4.6</version>
</dependency>