How and with what to track the incoming client?

Question

Computer networks

Good day.
Let's imagine such a situation.
There is a website, there is a person who came to us via a link from Instagram.
After several times during the month I went to the site via a direct link.
And then from the 4th visit I made an order.
How can I know if it's the same person?
Thank you
All the best =)

Answer 1

Cookies

Answer 2

we did this for one of the clients, here's how it works: link
Mechanism - by sending cookies to our server and linking them to the client's card in CRM