As promised, Starbucks has updated its iPhone app so coffee lovers can tip their favorite baristas in the US. Once users have ordered a fresh cup in store, they’ll be able to tip the person who took their order for up to two hours after the payment was processed. Screenshots show three different tip denominations – $0.50, $1.00 and $2.00_– alongside a timestamp for when the digital tipping feature will become unavailable. Starbucks also says that iPhone users will receive a push notification after each eligible transaction, presumably to remind them that they’ve been to a store that accepts the...

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