Isis adds Visa, MasterCard, American Express to mobile payment lineup
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Discover-only platform to let the competition in. Since then, the Goog's swept in with Google Wallet (backed by Sprint), which also counts MasterCard as a partner. Google's already got a head start, with Wallet trials underway in New York and San Francisco, but the internet giant might just need the lead, considering the list of heavy hitters Isis has lined up for its 2012 debut.