I should have paid attention to the warnings in this forum. But... no, I had to try for myself.
You all were right. 90+ days and still waiting for payment on a job completed in November '18. 5 invoices later, and I finally assigned it to collections. I'll lose 50% of the payment, but at least I'll get SOMETHING. Eventually. Had I done the job in the same manner Notary Cloud handles their vendor payments, I would be a bankrupt NSA!
Skip the calls from Notary Cloud. The work you do will be on your dime, because you won't see a penny from them.