Is there a CMS to find the "best price" for 7 online stores?

Question

CMS

Hello
Iskkal in the network is an engine for the service for determining the best price among several online stores and has not yet found it, or maybe such services are not done this way? I'm still not particularly knowledgeable in these matters, so I could not ask the question at all correctly.
The number of goods in these online stores will reach a total of 1,000,000 pieces. You can even make it so that the service does not download the entire list of goods to itself from online stores, but does a simultaneous search for them and gives out the best price for them.

Answer 1

CMS is a content management system or content / content management system.
Searching for information from third-party sites consists of several modules:
1. Crawler - who downloads pages
2. Parser - who searches for the necessary data on the page
3. Scrapper - who indexes and compares new data with old ones.
4. API - what allows you to search the results in the database and perform any operations.
Here are all these modules - you need to encode.
This is a difficult job, requiring 1.5-2 months of labor.
There are no ready-made solutions for this (at the moment).