ETechFlow Back-in-Stock Notification

Customers subscribe to out-of-stock products. When stock returns, they get an email.

Standalone-first — works on any Magento 2.4.4+ install without other ETechFlow modules. Integrates richer when paired with NDE / BED / ISP.

Install

composer require etechflow/module-back-in-stock-notification:^1.0
bin/magento module:enable ETechFlow_BackInStockNotification
bin/magento setup:upgrade
bin/magento setup:di:compile
bin/magento cache:flush
# Restart php-fpm to clear OPcache (mandatory on prod with opcache.validate_timestamps=0)

Activate the licence

php tools/generate-license.php --module=back-in-stock-notification --host=<your-domain>

Paste the key into Stores → Configuration → eTechFlow → Back-in-Stock Notification → License Key.

For multi-module customers, paste the bundle key into the Bundle License Key field instead. One key activates every ETechFlow module installed on the host.

Verify

bin/magento etechflow:bisn:verify

Twelve PASS lines means you're good to go.

How it works

1. Customer hits an out-of-stock PDP → a "Notify me when back in stock" form replaces the disabled Add-to-Cart button.
2. Form submit → etechflow_bisn_subscription row created. Anonymous (email only) or customer-linked.
3. Merchant saves stock with qty > 0 → StockSaveObserver enqueues a notification for every subscription matching that product + store.
4. Cron runs every 5 min → QueueConsumer sends batched, rate-limited emails. Default 60 emails/minute.
5. Customer clicks the email → one-click unsubscribe (RFC 8058 compliant) OR goes to the PDP to purchase.

Configuration

Stores → Configuration → eTechFlow → Back-in-Stock Notification:

• License Key — per-module key (or use Bundle License Key for the suite)
• Module Enabled — toggle the whole feature
• Email Rate Limit — emails/minute (default 60). Adjust to your SMTP capacity.
• Subscription Lifetime — auto-expire unredeemed subscriptions after N days (default 180, 0 = never)
• eTechFlow Suite Integrations — NDE / BED / ISP opt-in toggles (hidden if the sibling module isn't installed)
• Notifications — sender email, sender name, email subject template

Compatibility

• Magento Open Source 2.4.4 – 2.4.8
• Adobe Commerce 2.4.4 – 2.4.8
• PHP 8.1 / 8.2 / 8.3 / 8.4
• Hyvä Theme + Hyvä Checkout (PDP form renders via Hyvä-safe block)

Support

info@etechflow.com — please include your license key + Magento version when reporting issues.