Checking if the user is not a follower or not

Manychat allows me to change my automation flow basis on this condition (Whether the user is a follower or not). Recently while speaking to a fellow Instagram business owner, I got to know there is no official Instagram API to check if the user is a follower of your channel or not and there is a high chance Manychat is scraping our IG account to check for follower status. With this question, I want to clearly ask if Manychat is scraping our account to check for follower status? If not, pls provide with Instagram official documentation through which this is made possible on Manychat. 

Nothing can be more harmful to me other than getting my IG blocked, hence this is imp for me to