Specify diferent local instrument code

[PhoneixS]

The local instrument code is specified as a constant that can't be configured. I need to change it from its default value CORE to COR1.

Exactly is coded in line 845 of PaymentInfo.php (the last line of this fragment of code):

        protected function addPaymentTypeInfoToXml(\SimpleXMLElement $paymentInfo) {
            $paymentTypeInfo = $paymentInfo->addChild('PmtTpInf');
            $serviceLevel = $paymentTypeInfo->addChild('SvcLvl');
            $serviceLevel->addChild('Cd', self::SERVICE_LEVEL_CODE);

            $localInstrument = $paymentTypeInfo->addChild('LclInstrm');
            $localInstrument->addChild('Cd', self::LOCAL_INSTRUMENT_CODE);

I think it can be like other properties.

[dmitrirussu]

I have accepted your improvement

Thanks