uc_vat_number 6.x-3.x-dev

This version changes the location where VAT numbers are stored: #1390494: Save VAT number in its own table

This means that, if you have your own code that looks up an order's VAT number, you will have to use $order->vat_number rather than $order->data['vat_number'].

Additionally, there will be a property $order->vat_number_validated which is 0 if the VAT number has not been validated yet (because the service was down), else it will be 1 (assumed valid, input by admin) or a UNIX timestamp (date that it was validated through the VIES webservice).