When you input your payment details they are sent directly to Stripe over an encrypted connection, your card details don't even hit our servers.
Stripe hold your details securely and when it's time to take a payment we do so by sending a payment token to Stripe.
That way your card details are only ever held by Stripe, a company who's primary purpose is processing payments in a secure manner.
Stripe also publish their security information here:
If you have any questions on payment security then please do get in touch.