What happens after you choose
1 — Open an account
A minute, and free. Your basket comes with you, so you will not be typing these quantities again.
2 — Pay by card
Stripe takes the payment and collects the delivery address. Nothing is charged until you confirm it there.
3 — Labels arrive
Posted to the address you gave Stripe. Stick one on a parcel, set where it is going, and the person waiting gets told when it actually arrives.