Trending: Elizabeth Warren takes aim at Amazon’s taxes again during speech at Seattle rally

Starbucks has finally updated its Android app to enable its customers to tip their baristas using their phone. Customers will now have the option of adding no tip, 50 cents, $1 or $2 to their final purchase. The feature was first rolled out to iOS users six months ago. Another new feature added to the Android app today is the ability to “Shake to Pay.” The update is free and available immediately for download from the Google Play store.

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