The people who built the Danish e-invoicing solution are called Tradeshift and have a solution which follows open standards. They've also recently added cloud s

The people who built the Danish e-invoicing solution are called Tradeshift and have a solution which follows open standards. They've also recently added cloud scanning. If you're a corporate you can buy access for your suppliers to email pdfs to Tradeshift - and the magic is the supplier gets an email back asking them to validate the data. And emails telling them how much easier it would be to submit electronically in the first place. Much more elegant than the payment networks which charge the supplier a flat fee to submit an invoice.