Smart Links for a campaign
Put a published touchpoint behind a Smart Link, so its printed QR codes survive changes to the campaign.
If your plan includes Smart Links, print the Smart Link rather than the campaign's own link. When the campaign changes, or you move to another one, you edit the Smart Link and every printed code follows. Without Smart Links, print the touchpoint's own QR code: see QR codes.
Publish the campaign first: a draft has no public link.
Copy the touchpoint's link
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In the campaign's Build > Touchpoints, select Share on the touchpoint.

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Copy the first link: it opens the touchpoint directly.

If the campaign has a landing page for several touchpoints, you can copy its address from Landing Page instead.
Point a Smart Link at it
In Smart Links, create a Redirection Smart Link, as in Create a Redirection Smart Link.
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Paste the link into Destination URL.

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Select Save & Activate.

One campaign, several placements
Use one Smart Link per campaign and a variant per placement: posters, flyers, the newsletter. Analytics then compares them, and one edit moves them all to a new destination.
When the campaign ends
Point the Smart Link at the next campaign, or at a page that says it's over. Turning on Enable Expiration Date instead shows a "Not Found" page to anyone who scans after the date.
Once the date has passed, the link's badge reads Expired, and Smart Links won't save it with that date: "expiration date cannot be in the past". To reuse the link, turn Enable Expiration Date off or move the date, then change the destination.