Coroutine version.

simple.kt

class Rest {
    suspend fun sendInstalledApps() {}
    suspend fun updateCustomer() {}
    suspend fun checkClientVersion() {}
    suspend fun createOrUpdateDevice() {}
    suspend fun refreshCustomerToken() {}
    suspend fun getProfile() {}
}

suspend fun register(): Profile {
    rest.checkClientVersion()
    rest.sendInstalledApps(App.installedPackages)
    val device = rest.createOrUpdateDevice()

    val tokenData = if (device.data?.device?.isCustomer == true) {
        rest.updateCustomer(prefStorage.googleAuth)
        rest.refreshCustomerToken()
    } else {
        val td = rest.refreshCustomerToken()
        rest.updateCustomer()
        td
    }

    tokenData.data?.let {
        prefStorage.accessToken.set(it.accessToken)
    }

    val profileData = rest.getProfile()
    return profileData.data
}