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Signing certificate help
Most Android apps have at least two signing certificates, one for development and one for Google Play Store signing.
While developing your app, we recommend simply using your "debug" keystore file (learn more here) for generating your initial certificate fingerprint and key hash, and sharing that keystore with other Android devlopers on your team.
Where to find your debug keystore:
In a React Native app
keytool -list -v -keystore PATH_TO_KEYSTORE -alias KEYSTORE_ALIAS -storepass STORE_PASSWORD -keypass KEY_PASSWORD
The values for the debug keystore are always the same, so you can replace the placeholder values with these:
KEYSTORE_ALIAS = androiddebugkey
STORE_PASSWORD = android
KEY_PASSWORD = android
Note that you can only use one APK key hash (ie one certificate) per Passage App, so you'll need to create a separate production Passage App to register your production signing certificate.