Jean

When using the <a href="https://wordpress.org/extend/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a> plugin to sell digital downloads, this plugin will allow you to display the version number for each of your downloads.
What does EDD Changelog do?
It adds an <code>[edd_version]</code> shortcode you can use to display the software version number for EDD downloads.

EDD Version

Shortcode to output the version number of an EDD download. Requires the EDD Software Licensing add-on.

codulon

Codulon Serial Manager Lite lets store owners create and manage manual license keys directly inside WordPress.
This free plugin focuses on manual key management, customer lookup by shortcode, and a basic REST validation endpoint.
<h4>Lite includes</h4>
<ul>
<li>Manual license-key creation.</li>
<li>Automatic serial generation from the manual form.</li>
<li>License status management: active, suspended, and expired.</li>
<li>Searchable admin table.</li>
<li>Copy-to-clipboard serial buttons.</li>
<li>Basic customer shortcode: <code>[codulon_serial_keys_lite]</code>.</li>
<li>Working validation API for locally created serials.</li>
<li>First-activation binding to <code>hardwareId</code>.</li>
<li>Hardware ID mismatch protection for locally created serials.</li>
</ul>
<h4>Pro adds</h4>
<ul>
<li>WooCommerce order automation.</li>
<li>Automatic serial generation when orders are paid.</li>
<li>Product-level “Issue serial/license key” settings.</li>
<li>Product and variation license settings.</li>
<li>Perpetual license keys.</li>
<li>Time-limited license keys.</li>
<li>One-time evaluation licenses.</li>
<li>Paid upgrade targets for evaluation products.</li>
<li>Duplicate evaluation blocking by customer, website, or device.</li>
<li>Advanced manual serial entry with product and variation defaults.</li>
<li>Manual expiry/subscription controls.</li>
<li>Advanced status, sorting, filtering, and operational views.</li>
<li>Serial suspension, unsuspension, expiry, and revoke workflows.</li>
<li>Serial history logs.</li>
<li>Resend serial delivery emails.</li>
<li>CSV import.</li>
<li>CSV export.</li>
<li>Customer account delivery.</li>
<li>Customer serial status, expiry, activation, download, and evaluation-expiry details.</li>
<li>License PDF downloads.</li>
<li>Purchased file download links in account and email views.</li>
<li>Branded serial emails.</li>
<li>Order confirmation template.</li>
<li>Invoice / order-details payment template.</li>
<li>Renewal payment request template.</li>
<li>Trial-ending reminder template.</li>
<li>Expiry reminder emails.</li>
<li>Expired/revoked license notice emails.</li>
<li>Packing list and order item email sections.</li>
<li>Email template editor.</li>
<li>Test/sample email sending.</li>
<li>Restore default email templates.</li>
<li>Copy header/footer regions between templates.</li>
<li>Email-safe header logo/image sizing.</li>
<li>Email tokens for serials, renewal choices, order items, totals, VAT notes, customer data, store data, and downloads.</li>
<li>VAT note and tax/totals integration.</li>
<li>Store contact, footer link, and address tokens.</li>
<li>Email and shop theme settings.</li>
<li>Preset themes and color controls.</li>
<li>WooCommerce storefront styling for shop, cart, checkout, order, payment, and account pages.</li>
<li>Product images in email rows.</li>
<li>Subscriptions, renewals, and evaluation upgrades.</li>
<li>Renewal order generation.</li>
<li>Multi-license renewal selection page.</li>
<li>Early renewal extension handling.</li>
<li>Unpaid renewal handling.</li>
<li>Scheduled renewal and expiry sweeps.</li>
<li>Activation API checks.</li>
<li>Website/plugin activation binding.</li>
<li>Desktop app hardware ID hash support.</li>
<li>Activation mismatch protection.</li>
<li>Expired, suspended, revoked, and duplicate API responses.</li>
<li>API rate limiting.</li>
<li>API settings and integration guidance.</li>
<li>PDF, CSV, import, export, and operational tools.</li>
<li>Automatic revoke on cancelled, failed, or refunded WooCommerce orders.</li>
<li>Revoked and unpaid-revoked customer email handling.</li>
<li>Virtual license order processing support.</li>
<li>Built-in manual and documentation page.</li>
<li>Update delivery tools for the separate full version.</li>
</ul>
Buy the full version: 
https://codulon.com/shop
<h4>API reference</h4>
This plugin includes a working serial validation API for locally created serials:
<pre><code>POST https://yourdomain.com/wp-json/wc-custom/v1/validate-serial
</code></pre>
Required fields:
<ul>
<li><code>serial</code> – the license key shown to the customer.</li>
<li><code>hardwareId</code> – one stable activation identity.</li>
</ul>
For websites, WordPress plugins, or PHP apps, use the canonical site URL as <code>hardwareId</code>.
For desktop software, use a stable hashed device ID as <code>hardwareId</code>. Do not send raw hardware serial numbers.
Example JSON request:
<pre><code>{
 "serial": "ABCD-EFGH-IJKL-MNOP",
 "hardwareId": "https://example-client-site.com"
}
</code></pre>
Example success response:
<pre><code>{
 "valid": "True",
 "message": "Serial validated and hardware ID activated.",
 "email": "customer@example.com",
 "last_name": "Customer"
}
</code></pre>
Common failed responses use <code>"valid": "False"</code> with a <code>message</code>, for example serial not found, hardware ID mismatch, expired, suspended, or rate limited.
Important: this plugin validates serials created inside Codulon Serial Manager Lite. The separate full version uses the same endpoint path but validates WooCommerce serials, subscriptions, renewals, revoked access, customer order data, and advanced license rules.

Codulon Serial Manager Lite


Try the PRO plugin. In one word: Fantastic!


Great UI.

A lightweight tool for manual license-key management, including a working validation API.

EDD Version vs Codulon Serial Manager Lite