void InternalSendCustomRequest ( const [UScriptStruct](API\Runtime\CoreUObject\UObject\UScriptStruct) * RequestType, const void * RequestData, const [FGuid](API\Runtime\Core\Misc\FGuid) & DestinationEndpointId, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IConcertSessionCustomResponseHandler](API\Plugins\Concert\IConcertSessionCustomResponseHan-) > & Handler )