How to determine that a person went to the site through an ad unit?

Question

Yandex

Let's say there is some kind of stable traffic from different sites and from search engines, and the site has a product price of 100 rubles.

The task is to understand that a person went to the page through an ad unit (Yandex, for example) and increase the price for him to 200 rubles.

Maybe some special header is transmitted when clicking on an ad? Maybe a referrer?

Answer 1

utm label

Answer 2

Utm tags are the easiest option. I also recommend reading about retargeting in Yandex Metrica and integration with Direct, if you use the context.

Answer 3

Use UTM tags and Google Tag Manager. The latter can display the desired text on the page depending on the UTM tag.