Your expiring discount that never expires

Happy Wednesday!

Last month I opened a client's welcome flow and the second email was screaming at me. "Your code expires in 24 hours." "Last chance," with a countdown clock ticking down to zero right there in the email.

Except the code was WELCOME10. The same code every subscriber gets, the same code that was sitting in their flow a year ago and would still be there a year from now. The expiry was fake.

The customers who notice are your best ones

Here's the thing about a countdown that can't actually run out. The people most likely to catch it are your repeat buyers and your bargain hunters, the ones who've seen WELCOME10 three times or pulled it off a coupon site before they ever joined your list.

So the urgency is a bluff, and your sharpest customers are exactly the ones who can call it. That's a strange position to put yourself in. You're trying to look scarce to the people who already know you're not.

A static code never stays where you put it

It gets worse than just looking silly. A static code gets saved in someone's notes app, texted to a friend, and eventually posted to RetailMeNot or Honey for the whole internet to grab.

At that point the "exclusive welcome offer" is just a public discount with extra steps. You're handing money to people who were going to buy at full price, and you have no way of knowing it's happening.

That's the quiet cost. With one shared code you can't attribute a single redemption to a specific subscriber, so you see a pile of orders that used WELCOME10 and no idea which ones your email actually earned.

The fix: one-time codes with a real expiry

The fix is the same one I install in almost every account. Switch from a static code to one-time-use codes through Klaviyo's native unique-coupon integration with Shopify. Klaviyo generates a fresh single-use code per subscriber and drops it into the email.

Now the expiry is real. The code genuinely dies after one use or after the window closes, so the countdown finally has teeth. And because each code is tied to one person, you can see exactly who redeemed.

The objection nobody says out loud

There's an honest objection here, and it's the reason a lot of brands never make the switch. Unique codes are ugly. Something like WELC-7F3K9Q isn't memorable, and you're asking the customer to copy it, leave the email, and paste it at checkout, and every one of those steps loses people.

So you remove the steps. Shopify lets you build a link that applies a discount automatically, in the format /discount/CODE, which adds the code and drops the customer at their cart already discounted. You put that link behind the button.

The piece people get wrong is which code goes in the link. It has to be the dynamic per-subscriber code pulled from the Klaviyo coupon variable, not a hardcoded URL with one code in it. If you hardcode it, you've just rebuilt the static leak in a new place, because the whole point is that the link is unique to that person.

Done right, the customer copies nothing. They tap the button and the discount is already sitting in their cart. I add a single line next to the CTA so nobody goes hunting for a field to type into: "No code needed, your discount is applied automatically when you tap below."

Don't guess the number. Test it.

So what does this do to your numbers? I'm not going to give you a percentage, because anyone who does is making it up. Almost nobody A/B tests static against unique codes, which means almost nobody knows their own real number. They just assume.

So test it instead. Run it as a flow A/B, which is a 50/50 conditional split inside the same flow. Same copy on both sides, same urgency line, same everything, with one branch getting the unique expiring code and the other getting your old static code.

Then measure three things, not one.

My honest guess, and I'm stating it as a guess, is that the conversion lift will be small or noisy. The real money is in the margin you stop leaking and the discount you stop handing to strangers.

So what

Urgency is only as honest as the code behind it. Make the expiry real, take the friction out so the unique code costs the customer nothing, and then measure what it does instead of telling yourself a number.

Want a second set of eyes on your own welcome flow? I'll do a free deep-dive audit of your urgency setup. 100% free and yours to keep.

Talk soon,

- Raymond