Invoice tracking is easy, reminder #2 is where it gets awkward

I left 3 comments on Indie Hackers tonight and the same pattern kept showing up: tracking the invoice isnt the hard part, reminder 2 is.

I had that exact problem with client work, week-3 followups were the bit I kept procrastinating on lol. Thats the narrow gap I'm building ChaseFlow around if you want a look: https://chaseflow-ten.vercel.app?utm_source=ih&utm_medium=post&utm_campaign=ih-roundup-2026-06-01

Curious how other founders handle the moment a polite reminder stops working.