How does Wikimart/Yandex market, etc. work technically?

Question

PHP

When entering these sites, pre-prepared product cards (templates) are visible. When entering the template - a list of stores that have this product in stock. The store itself, unloads only the name of the product, the price ...... i.e. without linking the product to the store template.
Maybe someone has information on how a bunch of goods and a template is organized in such services. ? How technically it is possible to organize this task? Tell me please.

Answer 1

conventional neural network

Answer 2

prices are loaded by stores on the aggregator's websites, and then money is also paid from each transition from the aggregator to the store for the purchase, something like this, in short