VIES Check and VAT Rate update support
Another big must-to-have feature and I will ask on requested feature site, commonly is the VIES check support! If possibile with VAT rate update. Nothing strange, but if you work with EU customers you must have it (or the VAT MOSS request will fallen at all). If possible using rate systems/API that went from BCE (European Central Bank) for EU countries - Euro related, HMRC one for UK people - GBP related, with SNB (Swiss National Bank) for Swiss people - CHF related. Or almost have the XE.com one (but not only has having BCE, HMRC, SNB ones I think it's not difficult to have) ... in US think people need the same and not using some strange - not official - exchange sources as it can cause many accounting related matters!