WordPress powers ~43% of the web; WooCommerce is the dominant ecommerce plugin. Merchants there expect a .zip upload, not pasting code into functions.php.
Try the plugin
WP Admin → Plugins → Add New → Upload Plugin
Choose the zip → Install Now → Activate
Done. Try-on button appears on every WooCommerce product page.
What the plugin does
Hooks wp_enqueue_scripts on WooCommerce single-product pages
Injects widget.js with the WooCommerce gallery selector pre-wired
Adds a Settings panel under WooCommerce → FitMyMirror for API key (future)
Uninstall hook removes all options cleanly
Distribution plan
Phase 1: Direct download from this page (live now)