We are using Stripe to process payments, and Airinum doesn't have access or store your credit card details.
However, in order to provide you a better shopping experience, Stripe will store your credit card so you don’t need to fill in your bank details every time you check out.
Stripe is one of the most prominent and secure online payment providers. Stripe's clients include amongst others Kickstarter, Twitter, Pinterest and Slack. For more information about security at Stripe, read this page.