I uploaded my signed apk using the new Google App Signing, and found out I need to change the authentication keys in order for the APIs to keep working. The SHA1 is given directly on the google play console, so I used it successfully with for my Google APIs, however Facebook login key is different (28 characters ending by "=" ). Since I don't know the alias of the new keystore created by google, I don't know how to get this key. Hope someone can help. Cheers,
Q