* @param    int $product_id  WP Post ID of the course or membership
	 * @return   int|false
	 * @since    3.0.0
	 * @version  3.17.2
	 */
	public function get_enrollment_trigger_id( $product_id ) {

		$trigger = $this->get_enrollment_trigger( $product_id );
		$id      = false;
		if ( $trigger && false !== strpos( $trigger, 'order_' ) ) {
			$trigger_obj = $this->get_enrollment_order( $product_id );
			if ( $trigger_obj instanceof LLMS_Order ) {
				$id = $trigger_obj->get( 'id' );
			} elseif ( $trigger_obj instanceof WP_Post ) {
				$id = $trigger_obj->ID;
			}