Scan
Open any product on your phone
Point a camera at a code. Every URL is written out underneath as well — the code is a shortcut, not the only way in.
If a code will not scan
Fill more of the frame. Move the phone closer until the code fills most of the viewfinder, or zoom the page in. Camera apps need a certain number of pixels per module and a code shown small on a large display can fall under it.
Watch for glare. A reflection across the code breaks the contrast a decoder relies on. Tilting the screen a few degrees usually fixes it.
These codes are plain URLs. There is no redirect, no tracking parameter and no shortener — a scan opens the product directly. That also means you can simply read the address underneath and type it.
They are generated, not stored. Each code is produced from the product's URL when this page is built, so it can never point somewhere stale. Change a product's address and its code changes in the same commit.
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What each product actually does
The codes get you there fast. The products page explains which one is for you before you scan.