Add-on to the app in Kotlin + add login screen with code

Job ID: 31295073

Budget: $30 – $250 USD

Developed for me an Android app written on Kotlin.

The application is with one screen,
this is an application that sends automatic SMS messages at the end of a call / missed call.

The app is working properly and I have its code.

I want to add 2 things to the app:
1. When the message is sent, I want push messages to appear to the user who sent the SMS.

2. I want to add a screen with a code that will appear as soon as you open the app.
Only if the user enters the correct code, he will be able to use the app.
So I want there to be a list of codes in firebase and the app will check against that list.
Each code is valid only once. That means if the user enters the code correctly - they will no longer be able to use that code.


Plus, if you manage to upload it to me on Google Play, then you'll get paid extra.
I tried and Google rejects it.

If Google does not approve, then I will send it to customers as an APK.


I would love to know how much it will cost me.
Thanks.