Yep, have read both of those and neither answers my question. In playing around, it looks like when someone goes to use the custom connector I make (in a Flow or what not), they will be prompted to enter their own API key. Is this the case? At least when I added a Twitter connector, for experimiting, it prompted me for my credentials. I assume if someone adds my custom connector, they will be prompted to enter their own API key. Really isn't clear from the documentation.