add user details VAT number validation (choose the easiest way to make it)
using this looks the easiest way
[https://ec.europa.eu/taxation_customs/vies/rest-api/ms/[country]/vat/[vat]](https://ec.europa.eu/taxation_customs/vies/rest-api/ms/%5Bcountry%5D/vat/%5Bvat%5D)
So for example Vat ID = DE122268496
https://ec.europa.eu/taxation_customs/vies/rest-api/ms/DE/vat/122268496
https://ec.europa.eu/taxation_customs/vies/#/vat-validation https://viesapi.eu/
https://stackoverflow.com/questions/9158119/vies-vat-number-validation
using this looks the easiest way