How can this be done on the engines of online stores?

Question

Marketing

Good afternoon! I once ordered goods on Lamoda and was very hooked by a marketing trick: after placing an order, a letter about the successful completion of the purchase is sent to the buyer's mail, and below it is written "Share the sale link on social networks and get a 5% discount." And I used this thing, and a year after that, I somehow need this opportunity.)))
Question: how are there ready-made applications for cms to do this, and how is the fact that a person really shared a link tracked?

Answer 1

Social networks here are purely on the side, the main thing you need to pay attention to is the organization of a referral (affiliate) program. I have seen such plugins for almost any CMS, but I think it will still be necessary to add something to them by hand.
You think for yourself - there is a fact, another buyer came on the recommendation of your other buyer. Is it directly critical for you that he was from social networks? I think it's not important.

Answer 2

RewriteCond %{QUERY_STRING} ref=
RewriteRule (.*)  referal.php [L,QSA,NC]

Further - guess?!)

Answer 3

The fact is simple. Transition from social networks via a link (see referer). And to do on any by writing a plugin.