What purpose does appUpdateInfo.isUpdateTypeAllowed (AppUpdateType.IMMEDIATE) serve in Android In-App Update API?

These methods will always return true when there is a new update on playstore and current app version on device is less than the app version on playstore. To identify whether update is Flexible or Immediate we need to set a flag for FLEXIBLE or IMMEDIATE UPDATE in Remote Config like {"upgradeType":0/1} where 0 = FLEXIBLE and 1 = IMMEDIATE. For now we don't have any option in playstore console to set a flag for FLEXIBLE or IMMEDIATE update while releasing a build so for now we can set flag using remote config and identify whether update is FLEXIBLE or IMMEDIATE, might be in future playstore will give an option to set flag to identify for type of update.

Code:

val jsonObject=JSONObject(FirebaseConfig().getStringConfig(RemoteConfigConstants.KEY_APP_UPGRADE))
updateFlag = jsonObject.getInt(JsonConstants.UPGRADE_TYPE)

private fun checkForInAppUpdate() {
        appUpdateManager = AppUpdateManagerFactory.create(this)
        appUpdateManager.appUpdateInfo.addOnSuccessListener {
            if ((it.updateAvailability() === UpdateAvailability.UPDATE_AVAILABLE)) 
        {
                if (updateFlag == 0 && it.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE)) {
                    requestUpdate(it)
                    appUpdateManager.registerListener(this@HomeActivity)
                } else if (it.isUpdateTypeAllowed(AppUpdateType.IMMEDIATE)) {
                    requestUpdate(it, AppUpdateType.IMMEDIATE)
                }
            }
        }
    }

Here updateFlag value is the value we are getting from remote config for particular type of update.

I had already raised this issue in Google Issue Tracker here and I did receive response from the Google Developers as follows :

It is up to the developer to choose which type of update is invoked. The mode is determined by the app in code. Please see https://developer.android.com/guide/app-bundle/in-app-updates#start_update

I have already integrated in-app update api in GoIbibo Mobile Application and It is running all perfect now. The documentation had this ambiguity. So you should write your own logic whether you want Flexible or Immediate Update.