I created a Google form and response sheet with some added functionality using Apps script. I would like to deploy as an Add-on. I plan to charge a nominal fee (ie 0.99 cents) per year to use the add-on. I had hoped to send the link and "activation code" to a buyer and they would enter that code to activate the add-on. I've googled to the best of my ability, have reviewed Google developer material, and I am stuck. Can someone please help me better understand the process to accomplish this? Thanks so much.
Besides researching online, I don't know where to start.
