Creating an order
The checkout page, end to end.
The checkout page (Orders → Create order) builds a sale: products in the cart, a customer (or a guest), how they pay, and how they get their goods. The page's title is the running total — every change reprices on the server as you go, so what you see is what will be charged.
Who can do this: order creation is part of the counter roles — Admin, Store Admin and Cashier.

Search or scan products in. Each line can carry its own quantity (fractions where the product allows them), a per-line discount, and — where the product opts in — a price override. Special product types bring their own step: a customized product asks for its options, a pre-order for its date, a serialized product for its serials (or picks them for you).
Products that cannot be sold are refused honestly: drafts and archived products, and anything the store has switched off or forced out of stock.
If the goods have run out between drafting and confirming, the answer is the plain "One or more items are out of stock."
Choose the payment method (cash, card, bank transfer or store credit) and the fulfilment type. A straight counter sale can be born fully completed — paid, handed over, done in one step.
When the cart holds a pre-order or customized line that asks for a deposit, the summary shows Deposit due now from the lines' rules, and a Deposit (set by hand) field lets you decide the figure instead — leave it empty to use the rule, or enter zero for no deposit. See Recording payments & deposits.
On the Free plan, orders count against the monthly allowance — the 51st is refused with "monthly order limit reached for the free plan"; see How plans work.