Client Library Overview

Last updated on November 9, 2026

The SLSWC Client library enables WordPress plugins and themes to check for updates, manage licenses, and enforce DRM against an SLSWC-powered license server.

Location

libraries/slswc/client/src/

Class Reference

Class	Description
`Plugin`	Plugin updater. Hooks into `pre_set_site_transient_update_plugins` and `plugins_api`. Extends `GenericSoftwareUpdater`.
`Theme`	Theme updater. Hooks into `pre_set_site_transient_update_themes`. Extends `GenericSoftwareUpdater`.
`GenericSoftwareUpdater`	Abstract base class. Manages license details, creates `ApiClient` and `LicenseDetails` instances.
`ApiClient`	HTTP client. Sends requests to the license server's REST API (`/wp-json/slswc/v1/`).
`LicenseDetails`	License state manager. Reads/writes license details from WordPress options. Tracks activation status, expiry, and environment.
`DRM`	Grace-period enforcer. Escalating admin notices and full-page interstitial lock for unlicensed products.
`Helper`	Static utilities. File header parsing, environment detection, logging, data formatting.
`SoftwareUpdaterInterface`	Interface that `Plugin` and `Theme` implement.

Architecture

Plugin / Theme
    |
    +-- GenericSoftwareUpdater (base)
    |       |
    |       +-- ApiClient         (HTTP requests to license server)
    |       +-- LicenseDetails    (license state persistence)
    |
    +-- DRM (optional, admin-only enforcement)

Namespace

All client classes live in the SLSWC\Client namespace:

use SLSWC\Client\Plugin;
use SLSWC\Client\Theme;
use SLSWC\Client\DRM;

Quick Start

For Plugins

use SLSWC\Client\Plugin;

$client = Plugin::get_instance(
    'https://your-license-server.com/',
    __FILE__,
    array(
        'license_key' => get_option( 'my_plugin_license_key', '' ),
        'slug'        => 'my-plugin-slug',
    )
);
$client->init_hooks();

For Themes

use SLSWC\Client\Theme;

Theme::get_instance(
    'https://your-license-server.com/',
    WP_CONTENT_DIR . '/themes/my-theme',
    array(
        'license_key' => get_option( 'my_theme_license_key', '' ),
        'domain'      => site_url(),
    )
);

See Plugin Integration and Theme Integration for full guides.

Which Class Do I Need?

Scenario	Class	Guide
WordPress plugin with licensing and auto-updates	`Plugin`	Plugin Integration
WordPress theme with licensing and auto-updates	`Theme`	Theme Integration
Custom API integration (non-WordPress or headless)	`ApiClient`	REST API Overview
Copy protection with grace periods and admin lock	`DRM` (via `Plugin`)	DRM
Checking license state from your own code	`LicenseDetails`	Auto-Updates

Tip: You almost never instantiate ApiClient, LicenseDetails, or DRM directly. The Plugin and Theme classes create them internally. Use DRM configuration via the drm key in the args array passed to Plugin::get_instance().

Plugin Integration — Full integration guide for WordPress plugins
Theme Integration — Full integration guide for WordPress themes
DRM — Grace periods, admin notices, and interstitial lock
Auto-Updates — How update checks work under the hood
Hooks Reference — All slswc_* actions and filters