Today, at its second annual developer conference, PayPal announced the release of Mobile Express Checkout, a platform that will allow customers to pay for retail products in stores using only their mobile phones.

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After all, what better place than Apple's own developer conference would there be to announce a new mobile device platform, hm?

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Apple could preview the new software, which is expected to be part of its next mobile-operating system, as soon as next week at its annual developer conference, one person familiar with the plan has said.

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