scan.is_first

This parcel, the first time

The same code answers differently the first time than the next. is_first is true per code, not per person: exactly once in the life of this label, no matter who scans. That is why the axis works where one code equals one item — on a shipping label. On a door sticker the same rule would be nonsense: exactly one passer-by worldwide would ever get the first branch.

Where it hangs: Parcel label, inner lid, return label.

Why the paper stays: Two QR codes on one label, and the recipient scans the wrong one.

Live resolution

scan.is_first = true

geo.country = USdevice.os = ioslang.primary = en

1This parcel, first scan
2This parcel, scanned before
alwaysOtherwise

https://acme.com/setup

First scan of this label?

A cardboard box with a shipping label, carrying the code — **The same code on every shot.**Parcel label, inner lid, return label.

The ruleset

Valid, storable, mandatory rule last.

Not a description of what the engine could do — this is the text a code carries. The first matching rule wins, and the last one always matches.

ruleset · version 1

{
  "rules": [
    {
      "when": { "scan.is_first": { "eq": true } },
      "then": { "type": "redirect", "url": "https://acme.com/setup" }
    },
    {
      "when": { "scan.is_first": { "eq": false } },
      "then": { "type": "redirect", "url": "https://acme.com/support" }
    },
    {
      "when": "always",
      "then": { "type": "redirect", "url": "https://acme.com/product" }
    }
  ]
}

The third rule catches the case where the counter could not be determined. A scan still does not land in nothing.

Reprinting is the expensive part. Stop doing it.

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