Shopify and WooCommerce

Settings → Online stores → Add a store. You get an address and a secret; add webhooks in your store pointing to it.

• Shopify: Settings → Notifications → Webhooks. Add JSON webhooks for customer creation and update, order creation and payment, and checkout creation and update.
• WooCommerce: WooCommerce → Settings → Advanced → Webhooks. Add customer created and updated, order created and updated, with the same secret.

Every message is checked against its signature. Customers join your list, orders count as purchases, and checkouts left for an hour can start an abandoned-cart automation.