Problem with developing larger MVPs

This is mostly just ranting/getting stuff of my mind.

So I'm working on a new Billing system. To start off with it was just going to extend Stripe BIlling but I've found it needs more. The problem with a billing system is it's pretty complex and has tons of skeleton work that needs done before you can start to actually solve problems.

A MVP billing system is not a 30 day build, so far I'm about 60 days in and have tons of stuff left. So I'm left with this constant nagging feeling like this could all be a waste, which I kinda know it won't be. And I also know it's going to be a full-on B2B cold outreach sales approach to start off with which isn't going to be that much fun.

Things I know:

• Companies don't want to handle billing themselves. How do I know that, I've been at companies that didn't want to do it but did it because there was no real other choice. Stripe Billing and Recurly also show there is lots of demand for outsourced billing systems.
• Companies often sell white labels for their offerings which results in the need to send branded emails and whatnot. And they need reports to know how much to bill the client selling the white label. So my white labelling ability will be useful for those clients and save development time and financial time. I know this from handling white-labelled apps.
• Features such as the ability to notify customers that their cards are expiring can help reduce involuntary churn. Stripe billing only sends one notification, it can be helpful to send multiple. So that can be helpful to help increase revenue. I know this from surveys done by Recurly (thanks competitor)
• Features such as giving a user a credit note if they update their expiring card can help reduce involuntary churn from expiring cards. I know this from the surveys too.
• Features such as offering a discount to people wanting to cancel can also help reduce churn.
• I know account managers need to be able to find customer data for the clients they manage. So the ability to assign users to manage customers will be useful for those companies. I know this by working at companies and closely with account managers.
• I know companies like nice stats for their progress and finances.
• I know companies want to be able to keep track of and handle chargebacks.
• I know companies want to be able to edit their email templates without requiring dev work.
• I know companies want to be able to manage prices without development work. So they can change a plan to a new price via a web dashboard.
• I know companies want to be able to charge big clients custom amounts for custom plans. So the ability to have private plans with private prices will also be a big thing for many companies.
• I know companies change their prices and want to charge customers the new price to increase revenue so the ability to switch all customers on a price to a new price via stripe billing will save development time.
• I know this market is pre-validated with multiple competitors. Recurly and Lago both being billing systems, one being a closed source hosted option and Lago being an open source version.
• I know there are a few people wanting to hear back from me once I have a demo ready. Including one potential partner who has said they'll give me some intros. Which has never happened with any other product I've built.

So there are tons of things yet, still, I worry that this is all going to be a waste.

And then there are all the times I build a feature I think is pretty cool but I doubt anyone else will find cool. For example, the ability to define how emails are sent via an option in the settings. It supports MailGun, Postmark, and Sendgrid with support for using their templates and default support for using the twig templating language and system email sending. I just like that it can be done via the database values.

Or that it can import all the data from Stripe with a click of a button. It takes time obviously, but it'll allow onboarding users to import their customers and start using a lot of the functionality quickly without development work. Seems super cool to me.

Anyways. This is my rant about myself doubt. Hopefully, I can have something that is viable for people running SaaS systems using Stripe payments and/or billing by the end of this month.

I better get back to building it.