Your KiBook account has a built in store which enables you to have items for sale, any payments will process through Stripe and your customer will receive a confirmation email of their purchase!
How you handle the items is up to you, if you send an item digitally you can do so by emailing this to the customer's email address which is attached to their order. Or if you post items out you will find the customer's address details on their order. Alternatively, if your items are collection only please state this clearly on your KiBook account where possible!
Digital Gift Vouchers - You can go to the vouchers section of your account and create a new voucher code which is bookable by the customer! How to Gift Vouchers/Promo Codes