google generates new firebase web api key, how do i stop it from changing but use just one?

I use firebase for mobile app and website notification. It works wonderful but after 2 weeks or a month, it stops to wrk because google or firebase updated the web key to a different one making the notifications result in an error.

i would have to copy the new api key and go to the backend and update the key before it works on the website again and i would have to download the json file and integrate it into the app and update it on the store for users to update the apps before the notification works again.

its really stressing.