Passbook is one of the few features on iOS that I feel a bit envious of (even if it doesn't do payments like Google Wallet). Apparently Samsung had similar thoughts when it was announced, because the company unveiled a brand-new in-house platform this morning called Samsung Wallet that does basically the exact same thing.
Samsung didn't provide a launch time frame for the service, but we're guessing this was just a taste of the new software features we'll be seeing in the Galaxy S IV announcement on March 14th.
Wallet works quite similarly to Apple's Passbook platform, in that Samsung has announced a number of launch partners who will have items like gift cards, loyalty cards, discount cards, and boarding passes integrated for use in the app via barcode.

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Samsung Shows Off New Passbook-Like 'Wallet' App And API At MWC was written by the awesome team at Android Police.