PayControl SDK Hierarchy Class Hierarchy NSObject PCError PCISError PCKey PCKeyInfo PCQRCode PCKeyQRCode PCTransactionQRCode PCTransaction PayControlSDK UIView PCPDFView UIViewController PCQRCodeReader Protocol References PCQRCodeReaderDelegate Constant References PCCodeType PCConfirmationType PCIS_ERROR PCKeyType PCQRCodeAllowedType PCQRCodeType PC_ERROR_CODE