Hi everyone. I'm a truck dispatcher. I built a web app with driver performance tracking and + a lot of very interesting things. Single HTML file, vanilla JS, Google Sheets backend. Two versions: solo operator and fleet. The problem: It's just a static file on cPanel. Anyone can download and use it without paying. No real auth, no database, no way to enforce payment or revoke access. What I need: Paid customers who actually can't pirate it User login + payment verification Access...