[Home](./index.md) > [@snowplow/react-native-tracker](./react-native-tracker.md) > [EmitterConfigurationBase](./react-native-tracker.emitterconfigurationbase.md) > [idService](./react-native-tracker.emitterconfigurationbase.idservice.md) ## EmitterConfigurationBase.idService property > Warning: This API is now obsolete. > > Use `cookieExtensionService` instead. > Signature: ```typescript idService?: string; ```