Raising fees on small-ticket debit purchases could hurt self-service kiosks, such as DVD rental kiosks, which "benefit from debit-card acceptance, " Mr. McCrohan wrote.

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Redbox Automated Retail, LLC, a wholly-owned subsidiary of Coinstar, Inc. (Nasdaq: CSTR), offers new release DVD rentals through its network of conveniently located, self-service kiosks.

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The launch of the app is latest in a phased rollout of a significantly improved online and digital customer experience which also included the 2012 launches of the new delta.com in November and revamped self-service kiosks in September.

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It was not the most adept early adopter of online ticketing, self-service airport kiosks or in-flight technology and entertainment.

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Trolling for new clients wherever it can find them, Block recently opened 1, 000 new retail locations in the U.S. and another 250 self-service tax-prep kiosks in places like Wal-Mart.

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Instead, most are gravitating to self-service, whether on the Internet or at physical locations such as airport kiosks and ATM machines.

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