Bundled library that handles licensing, updates, and feature gating for WordPress plugins and themes.

It's recommended that you install Harbor as a project dependency via Composer:

composer require stellarwp/harbor

We actually recommend that this library gets included in your project using Strauss.

Luckily, adding Strauss to your composer.json is only slightly more complicated than adding a typical dependency, so checkout our strauss docs.

Initializing the Harbor library should be done within the plugins_loaded action, preferably at priority 0.

Harbor only boots its providers when at least one premium plugin announces itself via the lw_harbor/premium_plugin_exists filter. The filter must be attached before Harbor::init() is called, otherwise the gate inside Harbor::init() short-circuits and the providers, REST routes, admin page, and lw_harbor/loaded action are never registered. The simplest pattern is to add the filter on the line immediately above the Harbor::init() call (as shown below), but anywhere earlier in the request works just as well.

use LiquidWeb\Harbor\Config;
use LiquidWeb\Harbor\Harbor;

add_action( 'plugins_loaded', function() {
 /**
  * Configure the container.
  *
  * The container must be compatible with stellarwp/container-contract.
  * See here: https://github.com/stellarwp/container-contract#usage.
  *
  * If you do not have a container, we recommend https://github.com/lucatume/di52
  * and the corresponding wrapper:
  * https://github.com/stellarwp/container-contract/blob/main/examples/di52/Container.php
  */
 $container = new Container();
 // Use a plugin basename constant defined in your main plugin file,
 // e.g. define( 'MY_PLUGIN_BASENAME', plugin_basename( __FILE__ ) )
 Config::set_plugin_basename( MY_PLUGIN_BASENAME );
 Config::set_container( $container );

 // Announce that this premium plugin should bring Harbor online.
 // Must be added before Harbor::init(). Anywhere earlier in the request works,
 // but the line above the call is the simplest pattern.
 add_filter( 'lw_harbor/premium_plugin_exists', '__return_true' );

 Harbor::init();
}, 0 );

Package is using __( 'Invalid request: nonce field is expired. Please try again.', '%TEXTDOMAIN%' ) function for translation. In order to change domain placeholder '%TEXTDOMAIN%' to your plugin translation domain run

./bin/stellar-harbor domain=<your-plugin-domain>

or

./bin/stellar-harbor

and prompt the plugin domain You can also add lines below to your composer file in order to run command automatically

"scripts": {
 "stellar-harbor": [
   "vendor/bin/stellar-harbor domain=<your-plugin-domain>"
 ],
 "post-install-cmd": [
   "@stellar-harbor"
 ],
 "post-update-cmd": [
   "@stellar-harbor"
 ]
  }

Harbor discovers your plugin's embedded key automatically by scanning active plugins for a file named LWSW_KEY.php in the plugin root. No filter registration is required. See the Harbor Integration Guide for more details.

This project uses @stellarwp/changelogger to manage its changelog. All notable changes are tracked via changelog entry files in the changelog/ directory.

To add a new changelog entry:

bunx @stellarwp/changelogger add

To compile changelog entries into changelog.txt:

bunx @stellarwp/changelogger write --overwrite-version <version>

1. Run the Release Prep workflow (Actions → Release Prep → Run workflow). Supply the target branch, version (e.g. 1.2.0), and the release date (e.g. 2026-04-29). The workflow bumps the VERSION constant, compiles the changelog, and opens a PR automatically.
2. Review and merge the PR.
3. Create a GitHub Release with a new tag in the format vX.X.X targeting the merge commit.

Start with Harbor Overview for the full architecture.

• Licensing — Key discovery, API responses, validation workflows, caching.
• Catalog — Product families, tiers, features, the Commerce Portal API.
• Features — Feature types, resolution, strategies, Manager API.
• Cron — Scheduled refresh of catalog and licensing data.
• Frontend — React app, @wordpress/data store, component hierarchy, CSS scoping.
• Notices — Admin notices, legacy license warnings, persistent dismissal.

• Unified License Key — Key model, seat mechanics, system boundaries.
• Fat Leader / Thin Instance — Leader election, cross-instance hooks.
• Conventions — Naming conventions for namespaces, packages, identifiers.

• REST: License — License endpoints.
• REST: Catalog — Catalog endpoints.
• REST: Features — Feature endpoints.
• REST: Legacy Licenses — Legacy license endpoints.
• Liquid Web Licensing v1 — External licensing API consumed by Harbor.

• Integration Guide — How to integrate your plugin with Harbor.
• CLI Commands — WP-CLI commands for feature management.
• Testing — PHP tests with Codeception/slic; E2E tests with Playwright/wp-env.