OPTION 2 — SHOPIFY APP
Shopify is ~30% of online stores. Merchants there expect to "install an app", not paste code. This option meets them where they are.
Zero code. Auto-uninstalls cleanly.
widget.js into the storefront themeThe widget endpoint (/api/public/widget/tryon) and theme injection script are production-ready today. The Shopify App wrapper (OAuth + billing + admin UI) takes ~1–2 weeks and needs a Shopify Partner account ($0) plus one-time $99 App Store submission.
{# Added automatically to theme.liquid by FitMyMirror app #}
<script src="https://www.fitmymirror.com/widget.js"
data-fmm-shop="{{ shop.permanent_domain }}"
defer></script>