Retail point-of-sale systems today offer a wide range of options for peripherals and hardware. Their technical specifications play a major role in selection, and big retailers often choose multiple vendors to reduce a single point of failure. This gives them an advantage to negotiate price or support as well. Technically, these peripherals also require updating with new models and may have new feature sets. This necessitates the redevelopment of point-of-sale applications, increasing development costs.
Another problem with managing hardware interactions is that rapid scanning would generate a burst of requests, and we need a mechanism to handle them all. Failure to do so would result in lost messages, eventually causing poor customer experience or loss to retailers as they would sell items not scanned properly.
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