woocommerce/includes/class-wc-integrations.php

<?php
/**
 * WooCommerce Integrations class
 *
 * Loads Integrations into WooCommerce.
 *
 * @class    WC_Integrations
 * @version  2.3.0
 * @package  WooCommerce/Classes/Integrations
 * @category Class
 * @author   WooThemes
 */
class WC_Integrations {

	/** Array of integration classes */
	public $integrations = array();

    /**
     * Initialize integrations.
     */
    public function __construct() {

		do_action( 'woocommerce_integrations_init' );

		$load_integrations = apply_filters( 'woocommerce_integrations', array() );

		// Load integration classes
		foreach ( $load_integrations as $integration ) {

			$load_integration = new $integration();

			$this->integrations[ $load_integration->id ] = $load_integration;
		}
	}

	/**
	 * Return loaded integrations.
	 *
	 * @access public
	 * @return array
	 */
	public function get_integrations() {
		return $this->integrations;
	}
}