How to get Cost Per Results field in Facebook Marketing API?

Question

PHP

I need to get the Results field. You can find him Spent / CPR. The question arises how to get CPR (Cost Per Results). Facebook allows you to get it by requesting cost_per_action_type (as far as I understand, I can be wrong). But there are different types of action games coming in and I don't know which one to take. More precisely, I need a universal solution. For traffic, let's say I should take link_clicks. To convert leads. But if only it were that simple. There are not 1 or 2 types of advertising campaigns. The objective field does not help. How to understand what to take from cpr?

PS Google is completely silent. The FB Marketing API documentation provided little. SO is silent too. I've been trying to find a solution for several days, in the end I only find comments like "Hey, did you find a solution? I'm just looking too"