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Send SMS alerts through Klaviyo

Send back in stock and preorder SMS through your Klaviyo flows instead of STOQ's built-in SMS.

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Instead of STOQ’s built-in SMS, you can send your back in stock and preorder texts through Klaviyo. STOQ fires a metric for each SMS event, and your Klaviyo flow sends the message. This works for back in stock alerts, back in stock reminders, and preorder confirmations.

Before you begin

Section titled “Before you begin”
Requirement Detail
A paid plan Sending through Klaviyo is a paid feature, not available on the free plan.
Klaviyo SMS enabled Your Klaviyo account must have SMS turned on.
OAuth with flow permissions Automatic setup needs a Klaviyo connection with flows:read and flows:write scopes.

Switch the SMS provider to Klaviyo

Section titled “Switch the SMS provider to Klaviyo”

  1. Open the SMS provider panel

    For back in stock: in the left menu bar click Back in stock alerts, open Settings > Notifications, click Customize SMS, then click Send SMS through in the sidebar.

    For preorders: click Preorders, open Settings > Notifications, click Customize SMS, then click Send SMS through in the sidebar.

    STOQ Preorders > Settings tab > Notifications tab, showing the ‘Preorder confirmed’ notification card with SMS and Email channel chips, a Sent from preorders@preorders-test-sneha.stoqapp.com row, a Watermark visible row, and Customize email and Customize SMS buttons, with markers: 1 on Preorders in the left menu, 2 on the Settings tab, 3 on the Notifications tab, 4 on the Customize SMS button.

    The Edit templates for Preorder notification editor on the SMS template tab, with an SMS alerts panel showing Preorder SMS alerts Off and a greyed Turn on button and a toll-free registration note, a phone preview of the confirmation text on the right, and a Settings list where the Send SMS through row shows STOQ (marker 1).

  2. Choose Klaviyo and connect

    Select Klaviyo as the SMS platform and click Connect. Authorize STOQ on the Klaviyo page, then return and refresh. A green checkmark confirms the connection.

    The Send SMS through panel in the SMS template editor with an Unsaved changes header and Discard and Save buttons; under SMS platform the radio options are STOQ, Klaviyo (selected, marker 1) and Postscript, followed by a 1. Connect Klaviyo step with a green check and Disconnect button and a 2. Create a flow step with a STOQ - Preorder SMS confirmed flow name and Verify flow button.

  3. Set up the flows

    Choose Automatic setup to have STOQ create and activate the SMS flows for you, or Manual to build them yourself. One Klaviyo connection covers both back in stock and preorder SMS, though each metric has its own flow.

  4. (Manual only) Verify each flow

    If you set up manually, create a flow in Klaviyo triggered by the STOQ SMS metric, add an SMS action, activate it, then enter the exact flow name in STOQ and click Verify flow.

The metrics STOQ sends

Section titled “The metrics STOQ sends”
Metric Fires when
Back in stock SMS alert (STOQ) A product a customer wants is restocked
Back in stock SMS reminder 1 (STOQ) The restock reminder is due
Preorder SMS confirmed (STOQ) A customer places a preorder

Variables for the SMS text

Section titled “Variables for the SMS text”

Compose the message in the Klaviyo flow’s SMS action using event properties. Back in stock texts have {{ event.product_title }}, {{ event.purchase_link }}, {{ event.customer_name }}, and more (see back in stock variables). Preorder texts have {{ event.first_product }}, {{ event.order_name }}, {{ event.shipping_timeline }}, and more (see preorder variables).

Check your setup

Section titled “Check your setup”

For back in stock, sign up with your phone number and restock the product. For preorders, place a test preorder. Confirm the metric appears in Klaviyo and the SMS arrives on your phone.

Reset the setup

Section titled “Reset the setup”

At the bottom of the Send SMS through panel, click Reset setup to switch setup methods. Resetting clears the verification status in STOQ but does not delete the flows in Klaviyo.

Troubleshooting

Section titled “Troubleshooting”
The Klaviyo option is greyed out

Sending through Klaviyo requires a paid STOQ plan. Upgrade to enable it.

Automatic setup isn't available

Your Klaviyo connection is missing flow permissions. Reconnect Klaviyo so it includes flows:read and flows:write.

Flow verification fails

The flow name in STOQ must match the flow in Klaviyo exactly, including capitalization. Copy it straight from Klaviyo.

The test event reached Klaviyo but no SMS arrived

The flow may be in draft, SMS may be off for that flow, or Klaviyo’s quiet hours may be holding it. Set the flow live and check its send settings.

FAQ

Section titled “FAQ”
Can I use Klaviyo for SMS but STOQ for email?

Yes. The SMS and email providers are set separately, so you can mix them.

Who bills for the SMS?

Klaviyo. When SMS routes through Klaviyo, Klaviyo handles delivery and charges.

Do I need separate connections for back in stock and preorder?

No. One Klaviyo connection covers both. The flows are still configured per metric.

Section titled “Related guides”
Set up SMS alertsSTOQ's built-in SMS, the default before switching to Klaviyo.
Personalize Klaviyo back in stock emailsThe back in stock variables, which also work in SMS.
Personalize Klaviyo preorder emailsThe preorder variables for your SMS text.
SMS alert pricing and chargesHow STOQ's built-in SMS is priced, for comparison.
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