This is incorrect information
If you call it with client credentials or a user token without the scope then JUST the follower count is returned, which is all OP needs.
A user token is not required.
As to OP’s question:
You just need to be able to make HTTP requests.
But I don’t know if LUA is crippled inside Roblox to allow or prevent making HTTP requests.
Which makes this a roblox issue primarily.
The following might help