I already paid for PRO, but the subs not active yet
Check your Google Account: Make sure you are logged into the exact same Google Play account you used to buy the PRO key.
Clear Cache: Go to Android Settings → Apps → Google Play Store → App Info → Storage → Clear Cache (do the same for your Kustom app).
Restart & Wait: Force close the app, restart your phone, and give it 5-10 minutes to sync the license.
If it still shows as inactive after this, drop an email to [email protected] with your Google Play purchase receipt/order ID, and they will activate it manually.