modify a prefab script (switch facebook api to instagram api)

I want to use this script: [login to view URL] This script is made for facebook but I want it for instagram. Instead of a platform where people exchange post for money, I want to make a platform where people exchange shoutout for their page. A shoutout is when someone who own a big instagram page with a lot of followers post an invitation to his follower to follow another instagram page, a website or to download an app. (it's like making a post on facebook to promote something but it's on instagram) someone with a small instagram page will pay the guy with the big page to be promoted by him. but actually the transaction is made between each other so I want to make a platform where people who looking for a shoutout will be able to go and choose the page he want or someone who want to sell shoutout will find costumer The script above will be perfect for this, but it's for facebook so I need someone who will be able to put the instagram API on it.