Once your friend has sent you an invite link, you'll be directed to the App Store or Google Play, depending on the device you are using. After downloading the game and completing the tutorial, you can check if the friend who invited you is on your friends list. If they are not on the friends list, your referral has not been successful.
To resolve this issue, you can simply click on the same referral link that your friend sent you once again. Then, you will be able to enter the game, and it should resolve the issue. Once again, check your friends list to ensure the issue has been resolved
If your invited friend is visible in your friends list but you haven't received the cat yet, please ensure that your friend has attained at least level 5 and linked their account to either Game Center or Google Play.
Should you experience any further issues regarding friend referrals, feel free to reach out to our Support team, and we will gladly assist you!