You just have to use maven or gradle, you can get the API here
GitHub - LoneDev6/API-ItemsAdder: This is the ItemsAdder API repository. It serves as a Maven/Gradle reference for anyone looking to access the API without embedding/owning the entire plugin.
GitHub
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<repository>
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<id>jitpack-repo</id>
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<url>https://jitpack.io</url>
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</repository>
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<dependency>
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<groupId>com.github.LoneDev6</groupId>
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<artifactId>api-itemsadder</artifactId>
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<version>3.0.0</version>
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<scope>provided</scope>
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</dependency>
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Javadocs
api-itemsadder 3.0.0 API
Important notes
It's very important to listen to the ItemsAdderLoadDataEvent event in order to make sure items are correctly loaded before accessing them.