lib/Model/Checkout.php
public function getStateAllowableValues()
    {
        return array(
            self::STATE_CREATED,
            self::STATE_EXPIRED,
            self::STATE_APPROVED,
            self::STATE_COMPLETED,
            self::STATE_CANCELLED,
            self::STATE_DECLINED,
        );
    }
public function getStateAllowableValues()
    {
        return array(
            self::STATE_CREATED,
            self::STATE_EXPIRED,
            self::STATE_APPROVED,
            self::STATE_COMPLETED,
            self::STATE_CANCELLED,
            self::STATE_DECLINED,
        );
    }
Gets allowable values of the enum
@return string[]