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Has anyone built a way to auth apps without firebase or 3rd party services? everything i see on klibs is about firebase

context: I have my own backend and i need to sign in my desktop and web app s

The way i picture this is

app launches website to login -&gt; normal auth flow from the server side -&gt; deep link back into the app

Hello,
There is no official SDK for KMP. you must use a third party library or do it yourself with native SDK.

this can be done with pure kotlin i think. im currently authenticating the user on my website and will figure out today how to forward some sort of auth token to the device.

for the device it's all kotlin

Well the deeplink needs to be intercepted in the actual platform side (it’s platform specific) but you can do the implementation per platform and use standard expect / actual 

I was vague when i posted this because i didnt know what i was doing.

The main issue here is not the deeplinking but the authentication itself. after some research i see that the way to do this is by using PKCE, which i am working on implementing on my server now