Hi there! I understand you purchased a 3-month subscription on Piano Academy just yesterday, but now it seems to have disappeared. Let's get this sorted out for you.

To start, could you please confirm a couple of things for me?
1. Are you logged in to the same account you used when purchasing the subscription?
2. Did you buy the subscription through the app on your Android device or via a different platform?

Sometimes subscription activation issues can happen if the app isn't synced properly with your purchase. Here's a step-by-step guide to try first:

1. Check Account Login: Log out of the Piano Academy app and then log back in with the exact account you used to purchase the subscription.
2. Restore Purchases: Look in the app’s settings or subscription section for a "Restore Purchases" option and tap it. This often refreshes your subscription status.
3. App Update: Make sure your app is updated to the latest version available on your device.
4. Restart Device: After logging back in and restoring purchases, restart your Android device to clear any temporary glitches.

If after these steps the subscription still doesn’t show up, you might want to check your Google Play account subscriptions as well to see if the payment went through and is active there.

Could you try these steps and let me know what you find? If needed, we can look further into your account details or the payment status.

Are you ready to proceed or do you need help with any of these instructions?