We call it OneShot because the customer only has to generate the payment on your cashier and pay.
payment_typeto group our payment methods on different sections of your page, the
strikethrough_amountto show a promo on our Hosted Checkout, the
descriptionto show them what they are paying for or even your own
logoso the customer can see it on our Hosted Checkout. All of that, with only one integration described here.