How can I implement this HTTP-GET-Request API

hi,
ham trying to get this api to work:
http://www.opengtindb.org/api.php

In the documentation stands: i have to make a HTTP-GET-Request → http://opengtindb.org/?ean=[ean]&cmd=query&queryid=[userid]

They have a Demo User ID: User-ID 400000000

Its an EAN Scanner.

Sadly, I am not familiar with api calls and I try to get it run. Does someone knows, how to handle this?

Thanks a lot! :slight_smile:

Here is a video on using the appgyver api, I hope it helps.