private function get_topic_hooks( $topic ) {
		$topic_hooks = array(
			'coupon.created'   => array(
				'woocommerce_process_shop_coupon_meta',
				'woocommerce_new_coupon',
			),
			'coupon.updated'   => array(
				'woocommerce_process_shop_coupon_meta',
				'woocommerce_update_coupon',
			),
			'coupon.deleted'   => array(
				'wp_trash_post',
			),
			'coupon.restored'  => array(
				'untrashed_post',
			),
			'customer.created' => array(
				'user_register',
				'woocommerce_created_customer',
				'woocommerce_new_customer',
			),
			'customer.updated' => array(
				'profile_update',
				'woocommerce_update_customer',
			),
			'customer.deleted' => array(
				'delete_user',
			),
			'order.created'    => array(
				'woocommerce_new_order',
			),
			'order.updated'    => array(
				'woocommerce_update_order',
				'woocommerce_order_refunded',
			),
			'order.deleted'    => array(
				'wp_trash_post',
			),
			'order.restored'   => array(
				'untrashed_post',
			),
			'product.created'  => array(
				'woocommerce_process_product_meta',
				'woocommerce_new_product',
				'woocommerce_new_product_variation',
			),
			'product.updated'  => array(
				'woocommerce_process_product_meta',
				'woocommerce_update_product',
				'woocommerce_update_product_variation',
			),
			'product.deleted'  => array(
				'wp_trash_post',
			),
			'product.restored' => array(
				'untrashed_post',
			),
		);

		$topic_hooks = apply_filters( 'woocommerce_webhook_topic_hooks', $topic_hooks, $this );

		return isset( $topic_hooks[ $topic ] ) ? $topic_hooks[ $topic ] : array();
	}