Your application could utilize admin links in the order detail page to link to a QR code that's associated with that order. When you create the admin link for the order details page, the shop admin can click the link for your app.
Example:
When someone clicks the admin link, they'll make a request to the value for "Link target URL" with a query param named `id` that will have the Shopify order id as the param value. You can generate / find the QR code associated with that Shopify order id
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