Calling a Power Automate Cloud flow, from Power Pages forms (!) using Javascript

Calling a Power Automate flow from a dataverse form, in a Power Page form Sounds easy right? Trust me it’s not, but I hope this helps. I have had tremendous help from my colleague Laurens Hoogendoorn, who is completely awesome and helps me run with javascript (see what I did there) before learning how to crawl or walk. LOL. Laurens, you are the best! So, let me start at the beginning.