Hi! I understand you're trying to buy the RFS Pro subscription on your Android device, but the app keeps showing "RFS Pro checking..." and not completing the purchase. Let's get to the bottom of this together.

First, a few quick questions to narrow things down:
- Have you already attempted the purchase, or does it just stay stuck on "checking..." before you confirm?
- Are you connected to a stable Wi-Fi or mobile data network?
- Have you tried restarting your device and the app since this started happening?

Assuming you have a good internet connection and restarted already, here's a step-by-step approach to try next:

1. Check Google Play Store account and payment method
Sometimes, issues happen if there's a problem with your payment method or the Google Play account linked to the purchase. Go to your Play Store app, verify your payment methods are valid and up to date. Also, confirm you’re logged into the correct Google account on your device.

2. Clear cache and data for RFS and Google Play Store
- Open Settings > Apps > Find Real Flight Simulator.
- Tap on Storage and choose Clear Cache and then Clear Data.
- Repeat the same for the Google Play Store app.
- Restart your device and try buying RFS Pro again.

3. Delete obsolete RFS files in OBB folder
Sometimes, corrupted or old files can interfere. Using a file manager app, navigate to:
Android/obb/ folder on your device and look for any files related to RFS, especially named like it.rortos.extremelandings or it.rortos.extremelandingspro. Delete those files if present, then reopen the app and try again.

4. Check parental controls and permissions
If your device has any parental restrictions or account-based limitations, they can block purchases. Go to Settings > Digital Wellbeing & parental controls and disable any restrictions temporarily.

5. Ensure app is updated
Make sure you’ve installed the latest version of RFS from the Google Play Store.

If after all this it still says "checking..." and won't let you buy, sometimes the issue is on the app or server side, and you might need to contact RFS support directly using the in-game ticket system or email [email protected] with screenshots of the message and your purchase attempts1.

Would you like me to walk you through any of these steps in detail? Also, let me know which ones you've already tried so we avoid repeating.