Right way to fetch tweet count of an existing url


I know that this question was asked not once already, but I want to find right solution for such common situation. I have a need to fetch tweet count of already existing for a long time page. I need to get current tweet state of the page by it’s url.
I know about
discussions, but still this thing is not solved officially. Am I right considering this as a some kind of common used backdoor, that I can use too without thinking of how officially supported or allowed it is?