From PayPal to Google to conceivably Apple, many companies are getting in on the mobile wallet trend. Now, Placecast is looking to blow up the emerging market with its ShopAlerts Wallet product that credit card companies, mobile carriers and retailers can use for their own mobile wallet. Placecast CEO Alistair Goodman said Placecast’s white-labeled product, in the works for more than 18 months, would let companies compete with PayPal’s and Google’s mobile wallets. He wouldn’t discuss whether any brands have signed on to use ShopAlerts Wallet but said it expected to...