Sync codes with Klaviyo

If you send discount codes through Klaviyo, you normally have to export a batch of codes as a file and upload it into Klaviyo yourself, then remember to top it up before a big send runs out. Stackable connects the two directly: your codes flow into a Klaviyo coupon on their own, and Stackable watches how quickly your flows use them and refills the coupon before it runs low.

This works with any code campaign in Stackable. Each shopper in your Klaviyo send receives their own unique code, so codes cannot be shared or scraped the way one shared code can. To make each code single-use as well, set the campaign’s Total uses to 1, or limit it to one use per customer.

When to use it

• You run email or SMS campaigns in Klaviyo and want each recipient to get their own code.
• You send on a schedule or through automated flows and do not want to babysit how many codes are left.
• You have been exporting CSVs of codes and uploading them into Klaviyo by hand.

Before you start

You need a Klaviyo account and a Klaviyo private API key that has access to coupons. You create the key inside Klaviyo, under Settings, then API keys. Stackable never sees your Klaviyo password; it only uses this key, stored encrypted, and only ever shows you its last four characters.

Connect your Klaviyo account

1. In Klaviyo, go to Settings, then API keys, and create a private API key with coupon access. Copy it.
2. In Stackable, open Settings and find the Klaviyo integration section.
3. Paste your private API key into the Klaviyo private API key field and choose Connect Klaviyo.
4. Once it shows Connected, you are ready to link a campaign.

Link a campaign to a Klaviyo coupon

Open the code campaign you want to send through Klaviyo and choose Sync to Klaviyo. You can either create a new Klaviyo coupon, which Stackable makes for you and keeps stocked, or point at a coupon that already exists in your Klaviyo account. Then set how many days of runway to keep stocked.

After you link it, codes begin flowing to Klaviyo on the next sync cycle. In Klaviyo, add the coupon to your email or SMS the way you normally would, and each send pulls a unique code from the stocked pool.

How the automatic refill works

Stackable measures how fast your Klaviyo flows are actually using codes and tops the coupon up to match, rather than adding a fixed batch every day. If your sends speed up, it stocks more; if they slow down, it stocks less. When the pool runs low, it generates fresh unique codes automatically so a send never fails for lack of a code.

Good to know

• Codes are unique to each recipient. To make a code usable only once, set the campaign’s Total uses to 1 or limit it to one use per customer, so a code that leaks cannot be reused.
• Usage limits and expiry are set on the campaign, and every code from that campaign follows those rules.
• Shopify allows a very large but finite number of codes per store. If your store approaches that overall limit, Stackable pauses new code creation and Klaviyo top-ups and asks you to clean up unused codes first, so you are never surprised by a hard stop.