A cashier that sells by barcode, prints an 80 mm receipt, and works offline.

What you need on the counter

A device with a current browser: a Windows PC, a tablet, or an Android or iPhone. A barcode reader of the kind that types what it reads, as if it were a keyboard, over USB or Bluetooth; it needs no driver and no setup inside the software. And a thermal receipt printer with 80 mm paper, printing through the browser's print dialog. 58 mm paper is not supported, there is no customer-facing display, and scales are not connected: a weight is typed in.

What a sale can include

• A barcode scan, or a tap on a product grid with photos and a category filter
• F1 to F5 shortcuts for the most common actions, and a total large enough to read from the other side of the counter
• A discount on the line or on the whole cart, as a percentage or an amount
• Fractional quantities, and a barcode per unit: the case of water with its barcode and the single bottle with its own, with stock deducted in the base unit
• For dated stock: a batch picker at the sale that suggests the nearest expiry; an expired batch is flagged and can only be sold with an explicit, recorded confirmation
• Hold the sale while the customer goes for cash, and finish it afterwards
• Once a customer is selected, their price list and default discount apply automatically, loyalty points are earned, and a gift card can be redeemed inside the cart
• A credit sale posts to the customer's account; anyone over their credit limit is stopped, and whoever overrides it with the permission has their name and reason logged

The receipt

An 80 mm receipt with the shop's logo, address and phone, in Arabic, Kurdish or English according to the language of whoever prints it. From the invoice page you print an A4 copy or download a PDF. The WhatsApp button opens the chat with a link to the receipt page that stays valid for a year; no file is attached. The printed receipt and the PDF carry a QR to the same page, and the invoice shows when the customer opened it. A reprint is counted and written to the audit log under the name of whoever printed it; nothing is stamped on the copy.

Returns

With or without a receipt, refunded in cash or as a balance on the customer's account. A return without a receipt needs a permission and is logged under the name of whoever allowed it.

Ways to pay

Cash with the change worked out, or card recorded as its own payment method, or on credit to the customer's account. A wallet payment such as Zain Cash or Qi Card at the fast cashier is booked as cash; the separate "transfer / wallet" line exists on the invoice screen when a payment is split. Dashing does not process payments and takes no commission: the card or wallet terminal stays the bank's.

When the internet drops

Every sale is saved first to a database inside the browser on the till, then uploaded when a connection is available. Each sale carries a unique key, so it is never recorded twice however many times the upload is retried, and closing a shift waits until everything on the device has uploaded. If the server refuses a line at upload, such as an item with zero stock in a shop that does not allow negative stock, the sale goes to the recovery drawer with the reason. In the current version the fast cashier does not stop that line at scan time.