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Back In Stock Notifications for Klaviyo

Location: web/app/plugins/back-in-stock-notifications-for-klaviyo/ Author: Rhino Group (custom fork/build)

Overview​

This plugin integrates WooCommerce product availability with Klaviyo's email and SMS marketing platform to deliver back-in-stock notifications. When a product is out of stock, customers can register their interest. When stock is restored, Klaviyo automatically sends notification emails/SMS to interested customers.

Features​

Back-in-Stock Sign-Up Form​

  • Embeds a sign-up form on out-of-stock product pages
  • Customer provides email address (and optionally phone number for SMS)
  • Sign-up data is sent to Klaviyo and stored against the customer profile
  • Customer is tagged with the specific product SKU they are waiting for

Klaviyo Product Feed​

The plugin registers a custom Klaviyo product feed that:

  • Provides real-time product catalog data to Klaviyo
  • Enables product-level personalization in Klaviyo flows
  • Includes product images, prices, URLs, and availability status
  • Updates automatically when product data changes

Automated Flow Triggers​

When a product comes back in stock (WooCommerce stock management):

  1. WordPress fires woocommerce_product_set_stock_status (or similar hook)
  2. Plugin identifies all Klaviyo profiles waiting for that product
  3. A Klaviyo event is triggered: Back In Stock - {SKU}
  4. Klaviyo flow handles email/SMS delivery to interested customers

Configuration​

WP Admin → Klaviyo → Settings (or wherever your Klaviyo plugin settings are located)

SettingDescription
Klaviyo API KeyServer-side API key for event/profile updates
Enable Sign-Up FormsWhether to show the form on OOS products
Form PlacementWhere on the product page to show the form

Klaviyo Event Structure​

Events sent to Klaviyo when back-in-stock triggers fire:

{
  "event": "Back In Stock",
  "customer_properties": {
    "$email": "[email protected]",
    "$phone_number": "+16025551234"
  },
  "properties": {
    "ProductName": "1 oz Silver American Eagle",
    "ProductSKU": "SM-1OZ-SAE",
    "ProductURL": "https://www.scottsdalemint.com/product/...",
    "ProductImageURL": "https://cdn.scottsdalemint.com/...",
    "ProductPrice": 29.95,
    "ProductCategories": ["Silver", "Coins"]
  }
}

Integration with class-klaviyo.php (Theme)​

The suma-elementor theme's \Suma\Klaviyo class handles broader Klaviyo integrations (order tracking, customer profile sync). This plugin is specifically focused on the back-in-stock use case and the product feed registration.

See Klaviyo Integration for full Klaviyo documentation.