Problem is I work full time, as a Linux systems engineer (30 years of Unix experience), with a side passion for C programming, web technologies, and have built a hand full of web apps that are getting a lot of use at work (btw I'm not under any contract prohibiting side projects, and have cleared it with my management).
Next problem: The project itself is relatively simple, has client-side pieces that will be open source, and over all I prototyped it in about a weekend's worth of work, but need probably a month or so to get it more polished and robust. The upshot is that it can be easily replicated by anyone in a similar space. There are similar products that try to solve the same problem, but in a rather backwards and less secure method, but I'm really not sure why other vendors haven't thought of this project first.
Third problem: I'm relatively new at modern advanced web apps, so things like taking payments, handling customers, integrating to a customer's on-premise or cloud based authentication (O365, Active Directory, etc) is something I'm not too familiar with (for my projects I just used ldap bind for authentication against a local AD server).
So for my next step, should I put a prototype / demo site online, and let people create demo accounts that last for a couple weeks? Then if there is sufficient interest, set up something like a Stripe account? Start off with local user account authentication, then later on add the ability for customers to set up users authenticating against their own AD domain or O365 account?
Or would I be better off finding a business partner that has been through all this already?