Very similar to http://zencash.com who spell it out a bit better, but definitely solving a real problem that a lot of companies face.
2.9% is a pretty standard credit card processing fee. You'll find that it's the same price if you tried to do your own payment processing via stripe or paypal.
Do yourself a favor and check them out if you're shopping for this type of service.
Overall neat concept, but I really hate the idea of paying them 3% of my entire revenue just for sending invoices. I suppose that's about what credit cards charge, but if the customer pays check/cash, I hate to throw my 3% just toward sending an invoice.
As a more general answer to your posed question, always check the parent company's site-- most companies are pushing upgrades, integrations, and overall partnerships with their original software. Branding/Co Branding new apps and software is also a new "big thing".
Its called BillerApp, theyve just never marketed it
