A fully integrated shopping cart allows buyers to purchase more than one domain at a time and pay for them.
You get paid via PayPal and the domains are automatically marked as “sold” after a successful check out.
Optionally, for high ticket domains where you don’t want to risk a chargeback via PayPal, you can set up the system where you get a retainer or deposit via PayPal and the larger sum via Escrow or direct bank deposit.
So after the buyer selects “Checkout” they will see this screen:
On PayPal side, the payment page will contain the order summary that matches your domain marketplace’s checkout page.