Pop\Payment\Adapter\AbstractAdapter::validate PHP Метод

    protected function validate()
    {
        $valid = true;
        if (count($this->requiredFields) > 0) {
            foreach ($this->requiredFields as $field) {
                if (null === $this->transaction[$field]) {
                    $valid = false;
                }
            }
        }
        return $valid;
    }