How much time does your team spend building pricing and billing in-house?

Almost every team building usage-based or credit-based pricing I’ve talked to says something like:

“We just have to aggregate events, multiply with a price, and send it to Stripe.

Shouldn’t take more than a week.”

And a few months later, the reality hits when billing has quietly turned into an entire product of its own.

Suddenly, you’re debugging:

• Auto top-ups that fail for specific edge cases

• Cancellations that don’t sync across plans

• Credits that don’t roll over correctly

• Invoices that customers don’t trust

By then, 80% of the team’s bandwidth goes into fixing billing instead of building core features.

So I’m curious to know

• How much time has your team actually spent building or maintaining pricing & billing?

• Was it worth doing in-house?

• If you were starting today, would you still build it yourself?