I did write an Observer, after an order is placed I have to call a web service with all the data from the order. So everything is fine until now except if the customer chooses a new billing address instead of using the default one: in this case, in the same way I get the telephone:
which works perfectly, I try to get the VAT:
which doesn't work at all. I also tried:
with the same result. This is weird to me because the name of the telephone field, for example, is billing[telephone], and the vat's field is billing[taxvat], so I expected that to work.
Thanks a lot