We create a payment intent on our website and submit your payment information to Stripe. Stripe authorizes payment and returns us a payment method ID from the point on we refer to your credit card without knowing the actual credit card number, expiration date, or any other details.
For more information on how Stripe works please click https://stripe.com/docs/payments/cards/overview
On PayPal likewise, it's even more segregated. When you want to pay with PayPal we redirect you to PayPal website to get your payment authorized.
Although Ship7 is a PCI compliant merchant (complies with all security requirements guided by PCI), we choose not to save any credit card information in our systems.