Omnipay\PayPal\Message\AbstractRequest::getBaseData PHP Метод

    protected function getBaseData()
    {
        $data = array();
        $data['VERSION'] = static::API_VERSION;
        $data['USER'] = $this->getUsername();
        $data['PWD'] = $this->getPassword();
        $data['SIGNATURE'] = $this->getSignature();
        $data['SUBJECT'] = $this->getSubject();
        $bnCode = $this->getButtonSource();
        if (!empty($bnCode)) {
            $data['BUTTONSOURCE'] = $bnCode;
        }
        return $data;
    }