American Express may have been lagging a bit behind the likes of Visa and Mastercard with digital payments over the years, but it's making a pretty big play in the field today. It's just announced its new "Serve" digital payment platform, which is more or less a straight-on competitor to PayPal. That means you'll be able to transfer funds to your Serve account from your bank account or credit card, send money to other using either the website or mobile app (currently available for iOS and Android), and even link your account to a reloadable Serve card, which you can use at any retail
