Out-of-Stock Notifications
Shoppers tap Notify when available on sold-out items and get emailed when stock returns — they must be signed in.

Step-by-step instructions
1 Automatic when an item is sold out online
On product detail pages, when an item can still be listed but shelf quantity is 0 (and backorders are not covering the buy button), shoppers see Notify when available instead of (or alongside) the normal add-to-cart flow.2 Shopper must be signed in
On an ExtraCoins design, first use sends them to Account (email + password; confirm email once). After they are signed in, one tap toggles stock watching on that product. Guest checkout still works without an account.3 What you (the dealer) do
Nothing special in settings. When you restock the inventory item / listing so online quantity is available again, SpotPro can notify watchers via the shopper email path. Keep titles and photos accurate so the restock email and product page still match the coin.4 Related shopper tools
In-stock shoppers can still use wishlist and price alerts (bell). For store-wide hours, specials, and stock blasts, point them to footer Sign up for notifications — see Text & Email Signup.