The https://en.wikipedia.org/wiki/Point_of_sale Pos online shop is often referred to as the point of service because it is not just a point of sale but also a point of return or customer order.
If there is a price change, this can also be easily done through the inventory window. Other advantages include the ability to implement various types of discounts, a loyalty scheme for customers, and more efficient stock control. These features are typical of almost all modern ePOS systems