lib/Model/Address.php
public function valid()
    {

        if ($this->container['line1'] === null) {
            return false;
        }
        if (strlen($this->container['line1']) > 200) {
            return false;
        }
        if (strlen($this->container['line2']) > 200) {
            return false;
        }
        if ($this->container['city'] === null) {
            return false;
        }
        if (strlen($this->container['city']) > 50) {
            return false;
        }
        if ($this->container['state'] === null) {
            return false;
        }
        if (strlen($this->container['state']) > 50) {
            return false;
        }
        if ($this->container['postal_code'] === null) {
            return false;
        }
        if (strlen($this->container['postal_code']) > 15) {
            return false;
        }
        if ($this->container['country'] === null) {
            return false;
        }
        if (strlen($this->container['country']) > 2) {
            return false;
        }
        if (strlen($this->container['country']) < 2) {
            return false;
        }
        if (strlen($this->container['first_name']) > 200) {
            return false;
        }
        return true;
    }
public function valid()
    {

        if ($this->container['line1'] === null) {
            return false;
        }
        if (strlen($this->container['line1']) > 200) {
            return false;
        }
        if (strlen($this->container['line2']) > 200) {
            return false;
        }
        if ($this->container['city'] === null) {
            return false;
        }
        if (strlen($this->container['city']) > 50) {
            return false;
        }
        if ($this->container['state'] === null) {
            return false;
        }
        if (strlen($this->container['state']) > 50) {
            return false;
        }
        if ($this->container['postal_code'] === null) {
            return false;
        }
        if (strlen($this->container['postal_code']) > 15) {
            return false;
        }
        if ($this->container['country'] === null) {
            return false;
        }
        if (strlen($this->container['country']) > 2) {
            return false;
        }
        if (strlen($this->container['country']) < 2) {
            return false;
        }
        if (strlen($this->container['first_name']) > 200) {
            return false;
        }
        return true;
    }
validate all the properties in the model
return true if all passed

@return bool True if all properties are valid