Shopify OAuth2

I was just playing around with using Iguana to do the OAuth2 workflow for Shopify. Thought I would record my findings. If you go to this page:

https://docs.shopify.com/api/authentication/oauth

In Shopify’s documentation you can see what this code is doing.

local MyApiSecret = '521ecfe1780a998fcd52e4b6cba8e999'

function Redirect(Url)
   net.http.respond{debug_result=true, headers={Location=Url}, body='', code=302}
end

function main(Data)
   local R = net.http.parseRequest{data=Data}   
   if (R.location == '/registered') then
      net.http.respond{body="Congratulations - Your application has been installed"}
      return
   end
        
   local AuthUrl = 'https://'..R.params.shop..'/admin/oauth/authorize?client_id='..MyApiSecret..'&scope=write_orders&redirect_uri=http://localhost:6544/registered'   

   Redirect(AuthUrl)   
end