Back in stock alerts for WooCommerce — waitlist with double opt-in & GDPR-friendly consent, background sending that scales, core features free.

australcode

<p><strong>Australcode Back In Stock</strong> turns out-of-stock products into recovered sales. It is privacy-first (double opt-in and explicit consent built in), sends through Action Scheduler so big waiting lists never time out, and keeps every core feature free (Pro adds restock coupons, recovered-revenue tracking, SMS/WhatsApp alerts, email-marketing sync and webhooks). When a product is sold out, a “Notify me when available” form appears on the product page. Customers leave their email, and the moment you restock they get an automatic email with a link straight to it.</p>
<p>No more lost sales because a customer couldn’t be bothered to check back.</p>
<h4>How it works</h4>
<ol>
<li>A product runs out of stock.</li>
<li>A subscribe form appears on the product page (simple and variable products).</li>
<li>Customers enter their email — optionally confirming it first (double opt-in).</li>
<li>You restock the product.</li>
<li>Everyone on the waiting list gets an automatic email with a link to buy it.</li>
<li>Customers can unsubscribe with one click from any email.</li>
</ol>
<h4>Free features</h4>
<ul>
<li>“Notify me when available” form on out-of-stock products (simple and variable).</li>
<li>Shortcode and Gutenberg block to place the form anywhere — works with any page builder; add <code>mode="product"</code> for popups and modals (Elementor, Divi).</li>
<li>Automatic restock email with the product’s photo, price and a direct link — a card built to win the sale back, not just notify.</li>
<li>Per-product subscriber list in the admin, with KPIs, a “Top demand” panel, status filters and email search.</li>
<li>Optional double opt-in (email confirmation before subscribing).</li>
<li>Optional consent checkbox (privacy-law friendly).</li>
<li>One-click unsubscribe from every email.</li>
<li>Reliable background sending via Action Scheduler — works for products with hundreds of subscribers without timing out.</li>
<li>Cache and CDN proof — the form fetches a fresh security token at submit time, so it keeps working behind full-page edge caches like Cloudflare and Kinsta.</li>
<li>Developer hooks — PHP actions and filters (<code>acbis_after_subscribe</code>, <code>acbis_email_args</code>) plus an <code>acbis:subscribed</code> JavaScript event, to wire signups into your CRM, analytics or email tool.</li>
<li>Customizable button label and email subject/heading text.</li>
</ul>
<h4>Pro features</h4>
<ul>
<li><strong>Restock coupons</strong> — include a unique, single-use discount in each restock email. It is applied automatically at checkout (no copy-pasting), is restricted to the product and the customer’s email, and expires after the window you choose, so the urgency is real.</li>
<li><strong>Recovered-revenue tracking</strong> — a dashboard that attributes paid orders back to your restock coupons, so you see exactly how many sales and how much revenue the waiting list brings back.</li>
<li><strong>SMS & WhatsApp alerts</strong> — reach customers on their phone too, through your own Twilio account. Opt-in only: the customer adds their number and ticks a separate consent box, and the alert goes out by SMS and/or WhatsApp alongside the email.</li>
<li><strong>Email-marketing sync</strong> — every subscriber is automatically added to your Klaviyo list or Mailchimp audience (bring your own API key), so you can build flows and segments around real back-in-stock demand.</li>
<li><strong>Webhooks & demand alerts</strong> — fire a signed JSON webhook on every signup and restock (wire it to Zapier, Make, n8n or your own endpoint), and get a Slack or Discord ping the moment a product passes a demand threshold you set. Turn the waiting list into an inventory signal for your team.</li>
<li>Export the subscriber list to CSV (per product, with status and dates).</li>
</ul>
<p><a href="https://back-in-stock.australcode.io" rel="nofollow ugc">Get Pro →</a></p>
<h4>Privacy</h4>
<p>The plugin sends restock emails through your own site (<code>wp_mail</code> / your SMTP). The free plugin never sends your subscribers’ data to any third-party service: emails are stored in your own database, and the IP used for anti-abuse rate limiting is stored hashed, never in clear text. Two optional integrations are off by default: the Pro <strong>SMS/WhatsApp</strong> feature sends the phone number you collect — with the customer’s separate consent — to <strong>Twilio</strong> to deliver the message, and <strong>Freemius</strong> handles licensing and updates. Both are described under “External services” below.</p>
<h3>External services</h3>
<h4>Freemius (account, licensing & secure checkout)</h4>
<p>Australcode Back In Stock uses Freemius as its billing and licensing platform (Freemius is the Merchant of Record for Pro purchases). Connecting to Freemius is <strong>optional</strong>: on activation you can click <strong>“Skip”</strong> and the plugin stays fully functional without ever contacting Freemius.</p>
<ul>
<li>If you <strong>opt in</strong> (free or Pro), the plugin sends your <strong>admin email</strong>, <strong>site URL</strong> and basic <strong>environment data</strong> (WordPress, PHP and plugin versions) to the Freemius API (host <code>api.freemius.com</code>, path <code>/v1/</code>) to create your account and check for updates.</li>
<li>If you <strong>activate a Pro license</strong>, the plugin sends your <strong>license key</strong> and <strong>site domain</strong> to Freemius to validate the license and enforce the per-plan site limit. The license is re-validated periodically.</li>
<li>Purchases and license management happen on Freemius-hosted pages (hosts <code>freemius.com</code>, <code>users.freemius.com</code>).</li>
</ul>
<p>No data is sent to Freemius if you skip the opt-in and do not enter a license key.</p>
<ul>
<li>Terms of Service: https://freemius.com/terms/</li>
<li>Privacy Policy: https://freemius.com/privacy/</li>
</ul>
<h4>Twilio (SMS & WhatsApp delivery — Pro, optional)</h4>
<p>The Pro “SMS & WhatsApp alerts” feature is <strong>off by default</strong> and only works if you enable it and enter your own Twilio credentials. When a subscriber has given phone consent and a product is restocked, the plugin sends the subscriber’s <strong>phone number</strong> and the <strong>message text</strong> to the Twilio API (host <code>api.twilio.com</code>, path <code>/2010-04-01/</code>) so Twilio delivers the SMS/WhatsApp. Your Twilio Account SID and Auth Token are stored encrypted in your database and used only to authenticate these requests. No data is sent to Twilio unless you enable a channel and configure credentials.</p>
<ul>
<li>Terms of Service: https://www.twilio.com/legal/tos</li>
<li>Privacy Policy: https://www.twilio.com/legal/privacy</li>
</ul>
<h4>Klaviyo & Mailchimp (email-marketing sync — Pro, optional)</h4>
<p>The Pro “Email marketing sync” feature is <strong>off by default</strong> and only works if you enable a provider and enter your own API key. When a customer subscribes to a back-in-stock alert, the plugin sends their <strong>email address</strong> to the provider you enabled — Klaviyo (host <code>a.klaviyo.com</code>) or Mailchimp (host <code><dc>.api.mailchimp.com</code>) — to add them to the list/audience you choose. Your API key is stored encrypted in your database and used only to authenticate these requests. No data is sent unless you enable a provider and configure it.</p>
<ul>
<li>Klaviyo — Terms: https://www.klaviyo.com/legal/website-terms-of-use · Privacy: https://www.klaviyo.com/legal/privacy-policy</li>
<li>Mailchimp — Terms: https://mailchimp.com/legal/terms/ · Privacy: https://mailchimp.com/legal/privacy/</li>
</ul>
<h4>Webhooks & Slack/Discord demand alerts (Pro, optional)</h4>
<p>The Pro “Webhooks & demand alerts” feature is <strong>off by default</strong> and only sends data to URLs <strong>you</strong> configure — it is not tied to any service we operate. When you set a webhook URL, the plugin POSTs a small JSON payload (event type, customer email, product ID and name, timestamp) to that URL on each signup and restock, signed with an HMAC-SHA256 <code>X-Acbis-Signature</code> header so your endpoint can verify it. When you set a Slack or Discord incoming-webhook URL and a demand threshold, it POSTs a short text message to that URL when a product reaches the threshold. The destinations are entirely yours (for example Zapier, Make, n8n, Slack or Discord); review the terms and privacy policy of whichever service you point them at. No data is sent unless you enter a URL.</p>


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