Hello anyone Help me To do the dropbox

[Unnamed1]

Theres a Online script called Dropbox i saw someone do it but i cannot sadly in the script it need key before it actually open main script

 

Heres the Script 

function dropboxfile(link)
    gg.setVisible(true)
    local result ={}
        tableWithData = {
        ['path'] = "/" .. link
    }
    for key, value in pairs(tableWithData) do
        table.insert(result, string.format("\"%s\":\"%s\"", key, value))
    end
    result = "{" .. table.concat(result, ",") .. "}"
    load(gg.makeRequest("https://content.dropboxapi.com/2/files/download",{['Authorization']="Bearer _Q9AB0Hx_RkAAAAAAAAAAbkLPRn3vVb-QLJIBVY-84zsTjFUIDCMm3PSMvJNa3uU",["Dropbox-API-Arg"]=result}).content)()
end

dropboxfile("MainMenu.lua")

Now i want to actually do this to but cannot find any tutorial on yt pleas help me i already have dropbox acc with the same thing but idk how to get the key and do the same thing as this script if anyone have Solution it would be helpful 

[under_score]

official api documentation: https://www.dropbox.com/developers/documentation/http/overview