POS (Point of Sale)

The point of sale is where a purchase is completed, and the phrase covers two related things: the place itself, such as a till in a shop, and the kit that takes the payment there. A POS might be a full checkout counter, a small card reader on a table, a self-service machine, or a phone in a market stall. What they share is the moment: this is where goods change hands, money starts moving, and a business finds out whether the rest of its setup works.

The term has stretched over time. It used to mean a cash register that also took cards, and now it covers software that tracks stock, prints receipts, manages staff and talks to an accounting system. Card acceptance is one feature among many, and that widening matters more than it sounds. The payment part is often not the reason a business picks a POS, and it is often the part that causes friction afterwards.

The Parts Of A POS

There are usually three layers. The terminal hardware reads cards and holds the secure parts, the software builds the basket and tells the terminal what to charge, and the line out carries the request to an acquirer. Each layer can come from a different supplier, which is handy commercially and awkward when something breaks. Knowing which layer owns a problem saves a lot of time on a support call.

How A Card Payment Runs At A Till

The basket total goes to the terminal and the customer taps, inserts or swipes. The terminal and the card then agree what checks are needed, following the EMV chip rules to do it. The request goes out for approval, or in some cases is approved on the spot. The answer comes back, the receipt prints, and the sale closes in the software. Each terminal has a terminal identification number, so the traffic can be traced back.

Tap, Chip And Phone

Contactless payment is the default for smaller amounts in many markets, and it is quick because there is less to do. Above a local limit the terminal asks for a PIN or a device check. A mobile wallet presents a token instead of the card number and usually verifies the holder on the phone itself. In several markets a QR code does the same job with no card present at all.

When The Network Drops

A till that stops trading when the line goes down is a problem. Offline authorisation lets the terminal and the chip decide locally, within limits loaded in advance. That keeps the queue moving and moves some risk onto the business, since the bank has not seen the payment at the moment it was accepted. Setting those limits is a commercial call, not a technical default.

Cash Is Still On The Counter

Cards get the attention and cash has not gone away. In several markets it still covers a meaningful share of small purchases, and a till that handles it badly creates its own queue. The practical issues are mundane: float, reconciliation at close, and a drawer that has to balance. A POS that treats cash as an afterthought pushes that work onto staff at the end of a shift, which is exactly when mistakes get made.

Choice Of Brand At The Till

Where a card carries more than one payment brand, the rules have something to say. UK interchange rules stop anyone building in a mechanism that limits the payer's choice at the point of sale. A payee may set a default, and Article 8 of those rules says the payer must be able to override it. The position differs by market, so terminal configuration is worth checking against local rules rather than one global setting.

POS Beyond The Shop Floor

Not every point of sale has a counter. A virtual terminal lets staff take a payment typed in by hand, which suits phone orders, and a kiosk payment unit takes the staff out of the loop. A phone with a card reader turns a market stall or a delivery van into a till. Each changes the risk picture, because who is present and what can be verified is different in each case.

Joining The Store To Everything Else

The POS is one channel and customers do not think in channels. They buy online and return in store, or reserve on a phone and collect at a counter, and that only works when the till shares a customer record, an order record and a payment record with the website. That is the practical meaning of omnichannel payments, and the POS is usually the harder half to bring into line.

What To Check Before Choosing

Choose the software for the trading it has to support. Then check what card acceptance it allows, rather than the other way round. Keep terminal settings current, since scheme updates change how they behave. Set offline limits on purpose, not by default. Test one card of each type on every terminal model, because behaviour differs. And make sure the till writes the same order reference as the website. Card acquiring covers the money side. This guide to modern retail payment options covers the wider setup.

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