I have built a Google Script which is currently bound to my present Google docs document. It is a simple script that has a menu item and a Sidebar. I wish to access it from all my google docs document. I think the way to do it is publishing it on the Chrome Web Store as an add-on. It requires a developer fee of $5 which I have no problem paying but I want my script to be private(or shareable only to selected few) because it contains my API key that I don't want to share.
Please let me know if there is any alternative except publishing it as an add-on
If I publish it, can I use it privately and not share it. if that is true then how to do it.
If there is totally another way to do this, I'm all ears.
Sorry if that is a trivial question, I am a complete beginner.
P.S. I read a few answers saying it can be done but from my knowledge Google has updated the conditions, so wanted to verify before giving the developer fee