If you’re thinking without writing, you only think you’re thinking.
(Leslie B. Lamport)

Get the SHA-1 fingerprint of the certificate

* To get the release certificate fingerprint:

keytool -exportcert -list -v \
-alias <your-key-name> -keystore <path-to-production-keystore>

* To get the debug certificate fingerprint:

keytool -exportcert -list -v \
-alias androiddebugkey -keystore ~/.android/debug.keystore

* Example:

/usr/local/java/jdk1.8.0_112/jre/bin$ ./keytool -exportcert -list -v -alias androiddebugkey -keystore ~/.android/debug.keystore