Abandoned cart retargeting in VK (M video and MediaMarkt) How do they do it?

Question

contextual advertising

The other day I studied baskets and how the process of ordering goods in large online stores takes place. (I won’t name the list, you already know everything)
Literally the next day I have such announcements in VK

Left column with an abandoned basket from Media Markt and M Video.
I understand approximately the mechanism (What the goal is to set an abandoned cart and, starting from it, the parameter to whom to show is set)
Who used it can explain step by step how to do it and plus technically explain the mechanism, where what data comes from and what, where and how to configure.

Answer 1

Something like this https://vc.ru/p/basket-push
The example uses email marketing, and in your case retargeting. The essence is the same.
This, of course, depends on the settings of the advertiser's office.