Beginning in 2025 InStockNotify has started to integrate with Klaviyo. Customers that agree to receive marking emails when they register for an out of stock email can be added to one of your Klaviyo lists automatically.
Step 1: Create a Klaviyo private API key
https://help.klaviyo.com/hc/en-us/articles/7423954176283
The API key need to have access to Lists and Profiles:
Step 2: Edit the registration form settings in the InStockNotify app
(Settings -> Registration Forms in the settings menu)
Step 3: Go to the Email Marketing section of the Registration Form Settings
(*Note - this is a feature only available on the premium subscription)
- Click the Enable switch
- Enter the Klaviyo API you generated
- Click the Refresh List button
- Select the Klaviyo List
- Click the Save + Generate Script button
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