Overnight, the young mobile payment company Bling Nation Ltd. became visible to 4 million smartphone users.

Bling Nation, of Palo Alto, Calif., is now a part of PayPal Inc.'s iPhone app, which as of Tuesday was the fourth most downloaded free finance app on the iPhone. The companies have worked together before, allowing PayPal accounts to fund purchases made at the point of sale with Bling Nation's contactless payment system.

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