How to identify a client in online advertising?

Question

contextual advertising

There is a replenished customer base with full name, phone, email. How to identify impressions for a specific client (SMM, CPC, etc., the advertising channel is not important). Those. showed a banner or an ad, the visitor clicked on it, and we linked his session to the data in the database and identified that Ivan Ivanov with the number [phone] clicked on the banner ... Are there such identification systems?

Answer 1

if he himself leaves contacts in the form of a subscription, application, etc., then you can connect. Until I left - hardly

Answer 2

As an option:
1) For all clients, create a personalized link with GET parameters: site.ru?name=Ivanov+Ivan&phone=9999999 and with all other necessary parameters (the programmer can do this quite simply by looping through the selection from CRM)
2) Send out an e-mail newsletter with a transition to the site via personalized links (easily done using mailchimp, for example)
3) After clicking on the link, we take the data from the GET parameters and, using user variables, pass it to GA ( https://developers.google .com/analytics/devguides/...
Data seems to last for 2 years this way, unless the GA tracking code is changed.