If you want to see a proper integration of the Batch SDK and to test any of its functionalities, you can take a look at our sample apps.
Starting with 1.2.5, Batch is compatible with Prime31's activity sharing system.
Please check Prime31's documentation to setup that system, and then simply add the following line to your manifest:
<meta-data android:name="com.batch.android.unity.BatchUnity" android:value="UnityPlayerActivityProxy"/>
You can now proceed with the integration of the SDK.