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Watch it work
One walkthrough, both sides of it: minting a run and printing the cards in the admin, then scanning one of those cards on the storefront. Real store, real timing, nothing sped up.
The half that's yours
The first half happens entirely in your Shopify admin. Pick a product, say how many you are making, mint, download the sheet. There is no theme code to touch and nothing to paste anywhere.
The half that's theirs
They point a phone at a card. What loads is your storefront, in your theme, showing what the object is. No app to install, no account to make, no separate site to trust.
Rather read than watch?
How it works walks the same ground in writing, and the FAQ covers the questions a recording cannot: theme compatibility, what a scan does during an outage, and what happens to your register if you uninstall. If your workshop has a wrinkle neither one answers, tell us about it and we will answer ourselves.