Went on a spending spree with your Bank of America debit card the moment Apple Pay hit your iPhone? You might be in for a (brief) shock. The bank is now issuing refunds after it charged at least some Apple Pay users twice when they made purchases at retail shops. While it hasn't said what triggered the glitch, the issue doesn't appear to involve Apple's software -- there haven't been widespread reports of problems with other cards, and Apple itself doesn't process transactions. Whatever was the cause, it's not surprising that a major mobile payment service would run into some hiccups just after launch. Let's just hope that things go more smoothly from here on out.