A coupon or a sales slip is a Reçu that the Commerce S of detail give to each one of their customers in the shape of a printed band of Papier by the Cash register, on which figure the summary of their Achat S and the amount that they regulated. Sales slips are also delivered in the Restaurant S and the bars under the name of addition.

It is about a invoice, constituting a Preuve of purchase. Its presentation is thus required within the framework, for example, of the exchange or the resumption of a produced.

Various information being able to be reproduced on a sales slip is:

• the List of the purchases, presented in the form of columns: name of each product, Unit price, and many units if there are several of them;
• the entire amount;
• the Percentage and the amount of the taxes, as well as service in the case of a restaurant;
• the name of the trade, its coordinates (addresses, Phone number and of telefax, Web site, etc), like its schedules of opening;
• the Date and the hour of the purchase;
• the Identity or a code identifying the Cash clerk or the Salesman (or the waiter in a restaurant);
• the Means of payment chosen by the customer;
• in the case of a payment in species, assembling it presented by the customer and the currency which was returned to him;
• an unspecified message, for example advertisement of a promotional operation;
• a Secret code allowing to activate the Digicode limiting the access to the Toilet S, in certain establishments of Fast-food industry.

The system Informatique of the cases can be connected to the device of Vidéosurveillance, so that when a customer passes in case, the corresponding sales slip is encrusted, on line, in the images which are retransmises at the station of safety, in order to make it possible the operator to control that all corresponds and that nothing was stolen.

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