--- title: "Sync back in stock signups to Klaviyo" description: "Add customers who sign up for a back in stock alert to your Klaviyo account as profiles, automatically." url: https://help.stoqapp.com/back-in-stock/connect-klaviyo-for-back-in-stock/ product: "Back in Stock" section: "Integrations" last_updated: 2026-09-28 --- # Sync back in stock signups to Klaviyo > Add customers who sign up for a back in stock alert to your Klaviyo account as profiles, automatically. Connect Klaviyo so that everyone who signs up for a back in stock alert is added to your Klaviyo account as a profile, as soon as they register. You can then build segments, campaigns, and automations in Klaviyo from that audience. This guide covers the connection and the visitor sync only. To send the restock alerts themselves through Klaviyo instead of STOQ's built-in email and SMS, see [Send back in stock alerts through Klaviyo](https://help.stoqapp.com/back-in-stock/send-back-in-stock-alerts-through-klaviyo/). ## Before you begin | Requirement | Detail | |---|---| | Paid STOQ plan | Turning on visitor syncing requires a paid plan. | | Klaviyo account | You need an active Klaviyo account. The integration uses OAuth, so no API key is required. | Klaviyo connects once for your whole shop, and the same connection is shared with preorders. Syncing works whether or not you also route your alerts through Klaviyo. ## What gets synced With the sync on, both **visitors and buyers** are added to your Klaviyo account as profiles as soon as they register for a back in stock alert. Each profile carries the customer's details (name, email, phone) so you can segment and market to them in Klaviyo. ## Set it up On a phone, this menu is collapsed. In the **Shopify mobile app**, tap the **STOQ** logo at the top of the screen to open it, then choose the section named below. There is no hamburger icon. See [Finding the STOQ menu](https://help.stoqapp.com/general/getting-started-with-stoq/#finding-the-stoq-menu). 1. **Open the Klaviyo card** 1. In the left menu bar of the STOQ app, click **Back in stock alerts**. 2. Click the **Settings** tab. 3. Open the **Integrations** sub-tab. [Image: The Integrations sub-tab under Back in stock alerts Settings](https://help.stoqapp.com/images/general/inter.png) Then click **See integrations** to open the full **Integrations** page, find the **Klaviyo** card, and click **Set up** to expand it. [Image: The Klaviyo card on the Integrations page with its Set up button](https://help.stoqapp.com/images/general/setup.png) 2. **Turn on visitor syncing** Switch on **Sync visitors with Klaviyo**. This requires a paid plan. Turning it on reveals the **Klaviyo app** connection section below: the **Connect** button only appears once this toggle is on, so you switch it on first, then connect. [Image: The Sync visitors with Klaviyo toggle set to Off with a Turn on button](https://help.stoqapp.com/images/general/onvisitor.png) 3. **Connect your Klaviyo account** In the **Klaviyo app** section, click **Connect**. [Image: The Connect button in the Klaviyo app section](https://help.stoqapp.com/images/general/connect.png) 4. **Allow access in Klaviyo** In the Klaviyo tab that opens, log in if prompted and click **Allow** to grant STOQ access. You're returned to STOQ. [Image: The Allow access screen in Klaviyo](https://help.stoqapp.com/images/general/allow.png) If you previously connected with a private API key, click **Connect app** in the "Your Private API key is configured" notice to switch to the more secure Klaviyo app connection. 5. **Confirm the connection** The **Klaviyo app** section shows a green checkmark next to **Klaviyo app connected.** with a **Disconnect** option. Refresh the page if it doesn't update right away. [Image: The Klaviyo app connected confirmation with a green checkmark](https://help.stoqapp.com/images/general/connected.png) 6. **(Optional) Add a profile tag** In the **Profile tags** field, enter a tag to apply to every profile synced to Klaviyo, so you can find and segment STOQ signups. The same tag is shared across Klaviyo, Shopify, Mailchimp, and Omnisend syncing. [Image: The Profile tags field](https://help.stoqapp.com/images/general/tag.png) ## Check your setup 1. Sign up for a back in stock alert on your storefront with a test email or phone number. 2. In your Klaviyo dashboard, open **Profiles** and confirm the new profile appears, with your profile tag if you set one. ## Troubleshooting ### Visitor syncing isn't adding profiles to Klaviyo Confirm **Sync visitors with Klaviyo** is on and the card shows **Connected**. Syncing works independently of whether you also send alerts through Klaviyo. ### The Sync visitors toggle is greyed out Visitor syncing requires a paid plan. Upgrade to turn it on. ### The Klaviyo connection disconnected on its own The STOQ app was likely removed from your Klaviyo account, or the OAuth grant was revoked, which invalidates the connection. Reconnect from the Klaviyo card. Note that disconnecting also turns off visitor syncing. ## FAQ ### Do I need a Klaviyo API key to connect? No. STOQ connects using OAuth, so no API key is required. If you previously connected with a private API key, the card prompts you to switch to the OAuth app; connecting that way removes the old key from STOQ's settings. ### Can I sync visitors to Klaviyo without sending my alerts through it? Yes. Turning on **Sync visitors with Klaviyo** only adds profiles to Klaviyo. STOQ keeps sending the restock alert itself unless you separately choose Klaviyo as your sending platform. See [Send back in stock alerts through Klaviyo](https://help.stoqapp.com/back-in-stock/send-back-in-stock-alerts-through-klaviyo/). ### Does connecting Klaviyo here also affect preorders? The Klaviyo connection is shared across your whole shop, so it's the same account for preorders. The visitor sync described here applies to back in stock signups. ### What happens to synced profiles if I disconnect? Disconnecting stops new signups from syncing and turns the sync off. Profiles already in Klaviyo stay in your Klaviyo account. ## Related guides - [Send back in stock alerts through Klaviyo](https://help.stoqapp.com/back-in-stock/send-back-in-stock-alerts-through-klaviyo/): Route the restock email and SMS through your own Klaviyo flows. - [Sync signups to your marketing tool](https://help.stoqapp.com/back-in-stock/sync-signups-to-marketing-tools/): Sync back in stock signups to Mailchimp, Omnisend, or Shopify instead. - [Import a waitlist](https://help.stoqapp.com/back-in-stock/import-waitlist/): Bring an existing list of signups into STOQ in bulk. - [Manage your customers](https://help.stoqapp.com/back-in-stock/manage-back-in-stock-customers/): View, subscribe, unsubscribe, and export your signups.