Tried Apple's Passbook and Google's Wallet and not feeling satisfied? Perhaps Amazon's flavor of mobile payment app will strike your fancy. It's also named Wallet, and it arrived in beta form on the Google Play store recently. Like Apple and Google's versions, Amazon Wallet collects your gift cards, loyalty programs, and membership cards in one place -- on your phone -- and pushes them to the cloud. Should you switch from, say, Apple's iPhone to Amazon's Fire phone, all that information would move over with you, tied to your Amazon account.