When you have configured multiple APIs, you can specify the name of the API as a parameter as the target for an operation: ```dart Future<void> main() async { final operation = Amplify.API.mutate<String>( request: GraphQLRequest( document: graphQLDocumentString, apiName: '[FRIENDLY-NAME-API-WITH-API-KEY]', ), ); final response = await operation.response; final data = response.data; print('data: $data'); } ```