Comment by kode95

If you do multiple projects for each client, stall the work you're presently doing for every client that pays late. Let them know upfront that unpaid invoices immediately make you halt all work on the next stages of the client's project.

As for the AI solution you're suggesting, it's probably too easy for people to automate that kind of thing, so it might be a tough sell if you're charging $49 for it. But who knows.