Self-checkout is a retail setup in which customers scan and pay for their own items at a kiosk, without a cashier, while one attendant supervises several lanes. The kiosk combines a barcode scanner, a bagging-area weight scale, a touchscreen and a payment module, which authorizes online with the acquirer like a staffed till. Because nobody watches the device, payment rules treat it as an unattended or semi-attended point of sale: the PIN entry device needs PCI PTS approval, and many retailers add point-to-point encryption and skimmer inspections. Labour per transaction falls, but shrink from unscanned items rises, which since 2023 has led several US and UK chains to cap basket sizes or remove lanes.
What is self checkout made of
A standard lane combines a barcode scanner, a bagging-area scale that checks each item's weight against the product database, a touchscreen, a receipt printer and a payment module. Cash-accepting models add a note recycler and coin hopper, which is the most expensive and failure-prone component. Card-only lanes skip it and take up less floor space.
The lane connects to the store's point of sale software for prices and promotions, and one attendant screen shows every lane's alerts: age-restricted items, weight mismatches, and payment failures.
How does self checkout payment work
Once the basket is totalled, the kiosk hands the amount to its payment terminal, which accepts chip, PIN and contactless payment, including phone wallets. The terminal authorizes online with the acquirer exactly as a staffed till would, and returns the result to the kiosk software, which prints a receipt and unlocks the exit gate where one exists.
Security requirements are stricter than for an attended till because nobody watches the device. The PIN entry device must carry PCI PTS approval, and many retailers use point-to-point encryption so card data is encrypted inside the reader and never exposed to the kiosk PC. Skimmer inspection logs are part of normal store procedure.
Self checkout payment system formats
The classic kiosk is one of several formats. Scan-as-you-go uses a handheld scanner or the shopper's own phone, with payment at a fast lane or inside the app. Checkout-free stores, launched by Amazon Go in 2018, track items with cameras and shelf sensors and charge the card on file after the customer walks out, making the payment a remote card-not-present transaction rather than an in-store one.
Unattended vending and fuel pumps are related, but a supermarket self-checkout keeps an attendant nearby, which affects which card acceptance rules apply.
Losses and the economics
Self-checkout cuts labour per transaction, but retailers report higher shrink from unscanned or mis-keyed items. Several large chains in the US and UK have limited items per basket or reduced lanes since 2023 for that reason, and some have added AI cameras that flag skipped scans.
The payment side has its own loss vector: a terminal that approves offline during an outage, then sees authorizations declined later. Configuring floor limits and offline rules is a decision retailers make with their acquirer, not the kiosk vendor.