By the end, you’ll have: A proper plugin folder and main file A clean naming convention to follow A working “Hello from our plugin” message on the checkout page. Choose a Plugin Name & Slug. Let’s standardize things from the start. Use kebab-case for folder/file names, snake_case with a short prefix for functions. Plugin Folder Structure: Create a folder named simple-discount-rules with a main plugin file, includes folder, and assets folder.