I'm really looking forward to the next releases of the invoicing scripts that are in the works! I find the current solution rather impressive. There is simply no other solution to date that I have seen (and I've googled) that completely disintermediates payment processing to just buyer and seller. The only alternative to using middlemen is to run your own bitcoin wallet as a server -- and that requires technical skills, security skills, and includes additional cost and complexity that just wouldn't be feasible for small businesses. In every other shopping cart instance that exists, creating invoices, receive payment, and distribute goods online requires paying third party middlemen fees that make the cost of online business much more than it needs to be!
DNotes' solution does away with all of this, creating one of the first true "killer apps" for cryptocurrency in the blockchain-sphere. Bitcoin evolved ledgers to solve the double-spend problem to make decentralized payments possible. DNotes is actively making that technology useful for mainstream adoption.
And to think Joe was bouncing ideas with me some three-or-so years ago for this particular concept, before it was announced mid 2017 as a feature of DNotes 2.0. Now the first experimental versions are releasing, with a range of other shopping cart integrations.