Google Play App Signing

In case you are using the app signing feature of google play store, when you upload your release build to the google play store, it assigns a new SHA1 fingerprint to your app - which might lead to UNAUTHORISED_PARTNER_KEY error for your app, since the appKey used by you in your app config was generated for a different SHA1, and hence won't work for the new SHA1.

In this scenario, you need to note down the new SHA1 of your app from the Google Play Developer Console and then use this to generate a corresponding new "appKey" from the Truecaller Developer Portal. Use this new key in your app config and then upload the build on play store