Mobile wallet Curve launches ‘time travel’ tool to let you ‘shop in the past’ — Wired — “Once a person’s cards are uploaded to the Curve platform, they are all stored on a single Curve card. When shopping, they can then choose which account they would like to shop with using an app. If they change their mind, for example if they paid using a credit card but meant to pay with a debit card, the time travel tool lets them go back and swap.”