https://ec.europa.eu/digital-building-blocks/sites/display/D...
It's really nice though. I can set invoices to be paid automatically when they're under n€ and don't have to do anything to keep up with all of my payments.
Having moved over to the continent last year though, I am now having to deal with an enormous flood of paper.
Frankly if you are a business, having to pay a per year fee plus extra per invoice just so it all can be standardised and reduce the paper flood shouldn't be an issue, as long as the fees are not too great.
I'm not an invoice-using resident there so I don't know for sure, sorry.
Edit: quick googling found a few services that allow you to do electronic invoicing (peppol included) for €30/year.
https://ec.europa.eu/digital-building-blocks/sites/display/D...
Ah now I see that in the fact sheet for every country they write if the legislation also introduces a B2B mandate.
https://ec.europa.eu/digital-building-blocks/sites/display/D...
So currently there are B2B mandates (some in the future) for: Belgium, Germany, France, Italy, Poland(?) and Romania.
The only problem I see is certification requirements instead of just opened an API to where you can beam your signed xml blobs.