A boarding pass on cream: the age as the gate number in a monospaced box, sticker rows, and a tear-off stub with the code on top and a rocket landed on the cratered moon below it.
Half an A4 sheet. Two per page if your printer can do it. This is the ink-saving version: white paper, the party's accent kept and nudged until it stays legible on it. Switch back to Full colour for the version that looks like the party.
The code goes to the invitation site itself, so a guest who scans it lands on the countdown, the address and the RSVP — not on an app store.
The name Ava is invented, and so is the party — the QR on this sheet opens the matching sample invitation. Yours carries your child’s name and links to your own invite.