Here is an app for Starbucks fans, WearBucks an Android Wear app for giving you the option to pay using your smartwatch, the app is very easy to use just add your StarBucks card and then select the default card to appear on your Android Wear device, it uses the back end API http://api.wearbucks.com to provide you with the feature to pay for your StarBucks coffee.
Works with Nexus 5 (Android 4.4), Galaxy Note II (Android 4.4), LG G watch (Android 4.4) and other Android phone with the latest Android O.S
If you are worry about the security well, it uses SSL to encrypt all connections, the app works ok, and some of my friends are already using this app, works perfectly making it easy to pay for StarBucks without taking your credit card out or your phone.
Pay for Starbucks Coffee with Android Wear! NOTE: WearBucks is currently in public beta and requires an “Android Wear” device. Add your Starbucks cards then select a default card to appear on your Android Wear Device. Login with your starbucks.com account to view your dollar balance and Starbucks Rewards