VAT Number Checker for nBill Lite

This is an nBill Lite extension (use the nBill Lite extension installer, not the Joomla installer) which makes a new field type available for your profile fields. The VAT Number Checker field will prompt for an EU VAT number (providing a dropdown list of EU member states and a free format text box), and when the client saves their profile, it will check the number entered against the VIES database to ensure it is a valid VAT number.