eBay, Mobile phones, mobile technology, PayPal, Skype, Sony, Westfield Shopping mall and Windows. Mall-goers at the Westfield test enter their mobile numbers by pressing the interactive glass. The digits are visually hidden to protect shopper security. They then get a text message on their phones to complete the transaction. Shoppers can ask for free home delivery or pick up their items at mall stores that allow it.The connected glass used in the screens has some nifty features.