This documentation is written for WooCommerce developers who want to extend or integrate with the WooCommerce Subscriptions plugin. To follow this documentation, you need an advanced understanding of PHP and WordPress development.
If you are looking for a guide to creating and managing subscription products in a WooCommerce store, please refer to the Store Manager Guide instead. If you need to extend WooCommerce Subscriptions and are not a developer, select a WooExpert or Developer for assistance.
If you intend to support Subscriptions in your payment gateway extension, read this overview and then the Payment Gateway Integration Guide.
Most of the following guide is also applicable to supporting subscriptions with WooCommerce Payments as it is based on the same code base as the WooCommerce Subscriptions extension. However, as subscriptions with WooCommerce Payments does not include all features, and therefore all the same code, as WooCommerce Subscriptions extension.
API Overview↑ Back to top
Much like WordPress & WooCommerce, the Subscriptions extension can be extended through an API (Application Programming Interface) of actions, filters and functions.
In addition to this API, it also provides a number of new classes which can be used to instantiate and work with subscription data, both for subscription products and subscriptions.
Actions↑ Back to top
Action hooks are available for important subscription events. Examples of subscription events include subscription activation, cancellation, expiration. For the full list of action hooks triggered by WooCommerce Subscriptions, see the Action Reference.
Filters↑ Back to top
Filters are available for formatting and customizing data within the Subscriptions extension, like the “Sign Up Now” button text. For a full list of the available filters, see the Filter Reference.
Functions↑ Back to top
A range of functions are available to perform subscription related operations, like activating a subscription, and get subscription related information, like its sign-up fee. The most important of these are documented in the Function Reference.
Subscription Objects↑ Back to top
Subscriptions provides a number of classes for instantiating and working with subscription objects, including:
WC_Subscription: which extends
WC_Orderto instantiate a subscription object.
WC_Product_Subscription: which instantiate simple subscription product objects and extends
WC_Product_Variable_Subscription: which instantiates variable subscription product objects and extends
WC_Product_Subscription_Variation: which instantiates subscription variation objects and extends
These are discussed in more detail in the Guide to Subscription Data Structures & Storage.
Plugin Structure↑ Back to top
Subscriptions is built on a number of classes. The core of the classes is the
WC_Subscriptions class. This sets up the Subscriptions extension and loads all required files.
The rest of the classes:
- Customize a specific WooCommerce class of a similar name, for example
- Provide an imperative API for working with subscription data, like
WC_Subscriptions_Product, which can be used to access subscription product data.
- Instantiate an instance of an object to work with, for example the
WC_Subscriptionwhich instantiates a subscription.
- Implement all the logic associated with a unique subscriptions feature, like
Naming conventions for classes follow the WooCommerce convention. For example, the
WC_Subscriptions_Order class is located in the file
class-wc-subscriptions-order.php file in the
/classes/ folder. The difference to WooCommerce is that many of Subscriptions classes use static methods, as each class is created to operate on an object, like the
WC_Cart object, rather than create an instance of an object.
Some classes also exist with the
WCS_ prefix while others have the more verbose
WC_Subscriptions_ prefix. The later of these are a legacy of Subscriptions version 1.n codebase, which used the unfortunately more verbose naming. New classes are almost always use the more concise
WCS_ prefix. That is the only reason for the difference.
Documentation Contents↑ Back to top
- Guide to Multiple Subscriptions
- Guide to Failed Recurring Payment Retry System
- Payment Gateway Integration Guide
- Admin Change Payment Method Integration Guide
- Guide to Cart and Recurring Cart Fees
Technical FAQ answers:
- How to Debug Subscriptions PayPal IPN Issues
- How Does Subscriptions Handle Staging Sites and Migrations?
- Data Structure & Storage
- Subscription Function Reference
- Subscription Product Function Reference
- Subscriptions Management Function Reference
- Subscriptions Order & Cart Function Reference
- Action Reference
- Filter Reference
- Subscription REST API Docs Version 3
- Subscription REST API Docs Version 1
- Legacy Subscription REST API Docs Version 3
These reference guides should not be considered instructive for specific problems, as tutorials, nor exhaustive as they detail only a small subset of the available public API functions and hooks, of which there are many.