How to track the conversion of advertising on instagram, facebook to the site?

Question

Facebook

Hello.
We advertise on faceboo and instagram with a link to the site. When we click on this ad, we spend money, how can we track how much of the money spent was converted into a user's purchase on the site?
There are goals in Yandex and Google, but on Facebook these goals work differently. Maybe there are api methods of a pixel for marking the conversion of a visitor from an ad into a buyer?

Answer 1

Pixel and event layout. Everything is inside fb. You put the pixel code on the site, you set the events in the same way with the event code, for example, on the thank you page, after the purchase, or on the basket, and you track it ..

Answer 2

In addition to the Pixel, I see data on the Source/Channel metric in Google Analytics, conversions and transitions from Instagram and Facebook are also visible there.