What is licensed unde Apache2?

[licaon-kter]

Reading https://mvnrepository.com/artifact/io.intercom.android/intercom-sdk-base/15.9.2 says that the lib is FOSS

Reading https://github.com/intercom/intercom-android/blob/master/LICENSE says that this repo is FOSS

This repo has a Sample app, only

but... where's the source code if the FOSS lib?