Looking to transfer a mobile app to/from a client?
For Android, remember:
"You must use the same certificate throughout the lifespan of your app in order for users to be able to install new versions as updates to the app."
This means you will need to either get the certificate from the previous developer or share the current one with the new developer.
More info: https://developer.android.com/studio/publish/app-signing.html
For Apple: (TO DO)
