Curve is a prepaid Mastercard that lets customers add funds to refill its balance, access ATMs for free while traveling, and could generally be a safer option for shopping or traveling since the card can be frozen/unfrozen from an app in case it's lost. You can also link Curve to any of your physical cards and switch between payment methods on the fly, even after making a purchase. Curve is now officially supported by Apple Pay, which is great news for someone in Europe who may have a card they with to use with Apple Pay, but isn't supported by it. Ultimately, you can add your...