https://techcrunch.com/2020/10/19/facebook-introduces-a-new-messenger-api-with-support-for-instagram/

Following the updates to Instagram and Messenger that delivered cross-app communication and other features, Facebook today announced its Messenger API has also been updated to allow businesses to manage their communications across Instagram, in addition to Messenger .

Before today, businesses could only respond to customer inquiries through the Instagram app and through Facebook’s unified business inbox. This could work for some smaller businesses, but for larger brands with a high volume of messages, it could be difficult to be efficient this way.