WooCommerce API Custom Endpoint

A few years ago I have written a post on “How to create custom endpoint in WooCommerce API“. That was I think for v3 of older WooCommerce. After that, I did not get much time to work on WooCommerce products. But since then I was getting some queries on how to achieve the same for the latest version of Woo. So thought of doing some research. However when I saw their documentation today, it still says version 3, but everything is changed. Ironic.

Anyways, I quickly set up a local dev environment and tried to create a custom endpoint today. It’s much easier now. Since WordPress integrated REST API in it’s core, we can just register a route which would simply have wc/v3 as the $namespace, custom as the $route, and callback in the $args. This will have a custom WC Endpoint!
Code is as follows:

function get_custom( $data ) {
	return array( 'custom' => 'Data' );
}

add_action( 'rest_api_init', function () {
	register_rest_route( 'wc/v3', 'custom', array(
		'methods' => 'GET',
		'callback' => 'get_custom',
	));
})

You can add the above code in your theme or custom plugin.

However, if you want to extend WooCommerce REST Controllers, you can use woocommerce_rest_api_get_rest_namespaces filter.
1. Create a Custom REST Controller Class.

class WC_REST_Custom_Controller {
	/**
	 * You can extend this class with
	 * WP_REST_Controller / WC_REST_Controller / WC_REST_Products_V2_Controller / WC_REST_CRUD_Controller etc.
	 * Found in packages/woocommerce-rest-api/src/Controllers/
	 */
	protected $namespace = 'wc/v3';

	protected $rest_base = 'custom';

	public function get_custom( $data ) {
		return array( 'custom' => 'Data' );
	}

	public function register_routes() {
		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base,
			array(
				'methods' => 'GET',
				'callback' => array( $this, 'get_custom' ),
			)
		);
	}
}

2. Then register this custom controller in the wc/v3 namespace with the help of hook as follows:

add_filter( 'woocommerce_rest_api_get_rest_namespaces', 'woo_custom_api' );

function woo_custom_api( $controllers ) {
	$controllers['wc/v3']['custom'] = 'WC_REST_Custom_Controller';

	return $controllers;
}

Now navigate to your-site/wp-json/wc/v3/custom and test your custom endpoint. It should return {"custom":"Data"} or whatever you return in WC_REST_Custom_Controller‘s get_custom method.