I have released a new application to validate Value Added Tax and General Sales Tax Numbers called VATGST.
Just enter the VAT or GST number and hit the OK button and after a short while you will get the results, as can be seen in the screenshot below.
You can save the information as a text file.
I have also uploaded a short YouTube video of it in action.
The reason for an API key is that the free account allows 100 calls per 30 day period.
This is my first application using Curl.
Future plans for this application is for more formats to save the address.