If the retailers will do it manually then it might lead to some discrepancies. Some of the problems are like confusion in stock inventories, inconsistency in databases, discrepancies at the point of sale. All of these problems can be sorted with the point of safe software and point of sale apps. This software is easy to learn and classes can be organised for the operators. After the complete knowledge, they can use them on their own and very easily too.
Apart from this, you can handle the POS cash register with retail software POS app and you don't need any other system to record them. That is why; the cafe holders also use the cafe POS system for data management.