Of course. To change your saved card details, you need to be logged into the Moonpig website. The easiest way to change the details would be to do so next time you make a purchase. When you click on the Checkout button, you’ll see your saved card details, and you can click ‘Remove Card’.
Moonpig don't store your card details so if you’re worried about security, know that our partners at Stripe (a level 1 PCI-compliant payment service provider who specialise in this type of security) can be trusted to keep your information safe.