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I have a problem where I need to fecth data from the api(the stations), pick one of the results (station id) and pass it to another api call(to obtain the station details) and only then I should insert the values(in the Station database) to have all the complete information. These are my methods that make the fecthing from two apis and insert in Room database.
I put comments in the tricky places.

This is my first method

@SuppressLint("CheckResult")
 fun fetchAndUpdateDb(onSuccess: (User) -> Unit, onError: (Exception) -> Unit) 
 val login = accountUtils.getCurrentAccount()?.name
 ?: return onError(Exception("No user Account")).also cleanUserDatabase() 

 val password = accountUtils.getPassword()

 if (login.contains('@'))
 apiManager.loginAndFecthUserData(login, password, update(it, onSuccess, onError) , onError)
 

This is my second method:

fun update(userInfo: UserInfo, onSuccess: (User) -> Unit, onError: (Exception) -> Unit) 
 cardsRepository.updateCards(userInfo.AssociatedCards.AssociatedCards.distinctBy it.number ,
 

 //To cut code, I receive all the user info here
 // I am picking the api user data response and pick the favouriteStation
 doAsync 
 loadStations(userInfo.generalInfo?.favouriteStation?.toInt()!!)
 

 //only after the stations being load I should do this(PURPOSE OF THIS QUESTION)
 val entity = UserEntity(
 userInfo.generalInfo!!.clientNumber,
 userInfo.generalInfo.firstName,
 userInfo.generalInfo.lastName,
 userInfo.generalInfo.favouriteStation,
 userInfo.totalPoints.total,
 userInfo.generalInfo.accountState,
 stationName
 )

 userDao.insert(entity)
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(
 
 onSuccess(entity.toDomain())
 ,
 onError(Exception(it.message)) 
 )
 , onError
 )