What Is an Adisyon (Bill)? What Does POS Software Do? (2026 Guide)

An adisyon is an itemised statement of a tab. It opens when the table opens; tea, food and dessert are added to it as they are ordered; when the customer asks for the bill, its total is paid and it closes. A table can have several adisyons (split bills) or two tables' adisyons can be merged.

An adisyon does not replace a tax document (invoice, cash-register receipt); it is the venue's internal record. The official sales document is issued separately according to the venue's obligations.

With a paper pad the waiter writes the order by hand, passes the slip or the words to the kitchen and adds up the total on a calculator at the till. Four problems appear in a busy service: the handwriting is unreadable, the order never reaches the kitchen or reaches it twice, the total is wrong, and reconstructing what each table paid at the end of the day takes hours.

• •Paper bill: the order is handwritten, the kitchen works from a slip or a spoken order, the end-of-day total is added up by hand.
• •Bill/POS software: the order is entered from a phone or the cashier, appears on the kitchen display and receipt printer by itself, payment is recorded and the end-of-day report is produced automatically.
• •The difference: the same information is entered once; waiter, kitchen and cashier see the same record. Revenue, cancellations and the payment-method breakdown are not added up by hand afterwards.

Bill/POS software keeps the open tabs of the tables, routes the order to the right station, records the payment and closes revenue and the till at the end of the day. The product and price list, staff permissions, discounts and comps, bill splitting, payment methods such as meal cards, and reports are part of it. For the wider definition that includes hardware and QR ordering, see the restaurant POS system guide.

• •1. The table opens and a bill is created. The waiter enters the order at the table from a phone or at the cashier; an order coming in by QR goes through waiter approval.
• •2. The kitchen ticket prints. The order appears on the relevant station's display and receipt printer; food and drinks are split between stations.
• •3. Items are added. Extra orders are written to the same bill; the table can be moved or merged if needed.
• •4. The cashier closes the tab. The cashier sees the total and takes payment in cash, by card, meal card or split payment; the bill closes.
• •5. End of day. The Z report closes sales, cancellations, the payment-method breakdown and the till.

In Genu each step of this flow is its own screen: the waiter's phone, the cashier screen, the kitchen display and the management panel. Details: cashier and bills, waiter terminal, kitchen display, end-of-day report.

Cloud bill software runs its data on servers on the internet and opens in the browser; local software runs on the computer at the cashier; hybrid software runs in the cloud and keeps selling during an outage through an app installed at the cashier. The deciding question: if the internet drops in a busy service, can I open a new table, take payment and close the bill? For the three architectures side by side and the outage test see cloud, local and hybrid POS and POS that works offline.

Yes; some products offer a free core tier. The scope of such tiers is usually limited: modules, staff count, offline selling or support may be paid, and some earn their revenue from order commission. Before using one, check two things: does the free part cover your real service flow (kitchen ticket, split payment, end of day), and what is the total cost once you move to paid. A comparison of pricing models: POS software prices. Genu has no free plan; the 30-day free trial requires no credit card.

• •Selling continues when the internet drops: not just viewing open bills, but new orders, payment and closing.
• •Printer and Turkish characters: does the kitchen ticket print 'ş, ğ, İ' correctly; test with your own printer.
• •Waiter device: is your own phone enough, or is a separate handheld required.
• •Bill splitting and payment methods: split payment, meal cards, house accounts.
• •End of day: are sales after midnight written to the correct day.
• •Price model: yearly or monthly, VAT included or not, are extra modules and hardware included.

For the full 20-point list and the questions to ask in a sales call see how to choose POS software; for products grouped by category see best POS software in Turkey.

Genu brings bills and the cashier, the waiter terminal, the kitchen display, the end-of-day report, stock, customer accounts and QR menu onto one platform. Bills, the cashier and the kitchen display are on the Pro plan: $799/year, VAT included. On a cashier with Genu Desktop, new orders, payment and closing the bill continue when the internet drops; when the connection returns the records are processed to the cloud once. Detail by venue type: restaurant, cafe.