Where do services like Redlaser get product data based on barcodes?

Question

Database

Please do not send to www.upcdatabase.com/. There are no products, nothing.
Here are examples of barcodes that I found in the veterinary clinic, and which Redlaser understands:
0087219012918
5032362155901
0052742462806

Answer 1

They cooperate with manufacturers of various brands.
My own experience - when I worked in a wholesale pharmacy, we created our own barcode for internal needs, because the barcodes of domestic manufacturers were sometimes incompatible and in some cases could even cross with each other.
Later, services like Morion, Deon appeared, which created their databases by taking catalogs from many manufacturers. Then they began to take a catalog of goods with a code from them and everything became easier (more precisely, these Morions and Deons, who were engaged in the creation of a centralized catalog of the entire Ukrainian pharmaceutical market, had a headache).
It was a long time ago, I think now normal brands think before creating their own catalog with barcodes so that there are no compatibility problems.
RedLaser has a list of brands on the right side of its website that they work with. Everything is simple.

Answer 2

Well, if we take into account the service specified in your question, then:
- go to the FAQ section ( link )
- we find the text there

Why aren't my items in this database? How do I get items into this database?
They aren't there because nobody - you or anybody else - has put them there.

as well as

Manufacturer data is now gleaned from a couple of different GS1 sites around the globe that expose this information to the public. If a manufacturer name is missing, the either (a) the information isn't available from GS1, or (b) items from that manufacturer were only added here recently, and the site hasn't queried GS1 for the missing information yet.

And we get the following picture:
The manufacturer's data is taken from several different GS1 locations around the world that expose this information to the public.
Also, while searching for more details on Google, I came across a similar text:

This database is part of the GS1 global distributed database called GEPIR (Global Electronic Party Information Registry)

More info on Wikipedia ( link )