tips more on unity ...
in the case of os x, find in MacOS folder Easy answer: 1. copy AndroidManifest.xml from C:\Program Files (x86)\Unity\Editor\Data\PlaybackEngines\androidplayer to [your game]/Assets/Plugins/Android 2. edit that file to include everything needed by both of your plugins 3. Build and enjoy! Crazy answer that I started typing first before I thought of Easy answer: 1. grab the Amazon Android SDK, and install the unitypackage. 2. look at the manifest.xml that it puts in Assets/Plugins/AmazonIAPAndroid , and create your own manifest.xml files following the same format, in their own folders in /Assets/Plugins . (so, you'd have one Assets/Plugins/Vuforia/manifest.xml and one Assets/Plugins/EasyCodeScanner/manifest.xml ) 3. In the Unity Editor, under the "Amazon" drop down menu, ...