Getting Default New User License of customer portal in Aped code.

DefaultNewUserLicense.cls

public String getDefaultNewUserLicense(){
    String siteName = 'YOUR_SITE_NAME'; // Your Site Name
    String portalName = '';
    String defaultUserLicenseName = '';
    String profileFullName = '';
    
    // Setup Connection
    MetadataService.MetadataPort service = new MetadataService.MetadataPort();
    service.SessionHeader = new MetadataService.SessionHeader_element();
    service.SessionHeader.sessionId = UserInfo.getSessionId();
    
    // Reading Site Metadata to get portal name
    MetadataService.IReadResult resCustomSite = service.readMetaData('CustomSite', new String[] { siteName} );
    MetadataService.Metadata[] infoCustomSite = resCustomSite.getRecords();
    for(MetadataService.Metadata md : infoCustomSite){
        MetadataService.CustomSite siteInfo  = (MetadataService.CustomSite) md;
        portalName = siteInfo.portal;     
    }
    
    // Reading Portal Metadata to get profile name of portal
    MetadataService.IReadResult res = service.readMetaData('Portal', new String[]{portalName});
    MetadataService.Metadata[] info = res.getRecords();
    for(MetadataService.Metadata md : info){
        MetadataService.Portal pt  = (MetadataService.Portal) md;
        profileFullName = pt.selfRegUserDefaultProfile;     
    }
    
    // Reading Profile Metadata to get Default New User License
    MetadataService.IReadResult resProfile = service.readMetaData('Profile', new String[]{profileFullName});
    MetadataService.Metadata[] infoProfile = resProfile.getRecords();
    for(MetadataService.Metadata md : infoProfile){
        MetadataService.Profile pr  = (MetadataService.Profile) md;
        defaultUserLicenseName = pr.userLicense;     
    }
    System.debug('### Defualt New User License = '+defaultUserLicenseName);
    return defaultUserLicenseName;
}