This looks quite cool.
I already suggested a very similar functionality for the Odoo integration here: Taler-Odoo Payment System (TOPS) has been submitted to NLNet for funding - #4 by Kris
Since your software seems to be an Odoo fork, it would probably make sense to cooperate on this.
P.S.: It is a bit confusing to call the use of a distributed database (via blockchain technology) federation. I would suggest you to re-think your marketing strategy there a bit. I understand that blockchain has a bad reputation these days, but just calling it federation when it really is nothing like that is very misleading.