Add support for United Kingdom (Northern Ireland) ("GB-NIR") about vies HOT 7 CLOSED

Yes @jonathanmaron, you're absolutely correct. I suggest that before we remove UK completely (#126) we should first look at integrating Northern Ireland correctly.

What I'm missing in the documentation up to this point are the structure definition and which calculation method is being used to verify if this new VAT ID is formatted correctly. Do you have some details about that?

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I would agree with you to add "United Kingdom (Northern Ireland)" before we remove "United Kingdom".

The only documentation that I found on the structure of the new XI VAT numbers is at:

https://www.avalara.com/vatlive/en/vat-news/brexit-northern-ireland-vat-and-eoro--xi--number.html

The UK and EU have agreed the above transactions should use the "XI" country code instead of "GB" for VAT numbers on invoices and statistical declarations. [..] Businesses should substitute "XI" country code in their GB VAT number on invoices so that the transactions can be identified separate from UK VAT transactions. So XI 123456789 - instead of GB 123456789. [..] There is no requirement to apply for a new "XI" VAT number. Businesses with NI postcodes will automatically be assumed to be operating within the terms of the NI Protocol.

According to that, we can simply re-purpose the current "United Kingdom" validator.

from vies.

Yes, this can be done. Do you want to replicate the UK validator for Northern Ireland @jonathanmaron, including the tests?

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It would be my pleasure to implement the require classes.

from vies.

And done. See pull request #128

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If you search for some town names in Northern Ireland in the "Enter company name" text entry box at http://www.vat-check.co.uk you can find some real VAT numbers belonging to Northern Ireland businesses. Simply replace "GB" with "XI" for test purposes.

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Merged #128 after updating GitHub Action to test against PHP 7.4 as some components are not yet ready for PHP 8 unfortunately.

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