In some apps we need to use a "Facebook login", for our apps or games in Unity. (setting scores, etc)
For that purpose, we must provide a "Hashkey" for our game to work, and put that keyhash on our Facebook developer page (https://developers.facebook.com/apps/YOURAPPID/settings/basic/)
¿how to get our app Hashkey?
with keytool command:
1: (install if not already, OpenSSL in c:\Openssl)
2: (go to your jdk dir) cd C:/Program Files/Java/jdk1.8.0_181/bin
3: keytool -exportcert -alias fq2 -keystore "C:\Users\joe\Documents\PATHKEYSTORE\APP.keystore" | C:\OpenSSL\bin\openssl sha1 -binary | C:\OpenSSL\bin\openssl base64
Thats it! You will get a 28 digit Hashkey, you must put it on your Facebook App on facebook:
(if your app says: " 28digit Hashkey not recognized" copy that "28digit" hashkey on the same facebook developer app.)
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