Hi there! I see you're having trouble checking out on the Subway app using your Android device (OS version 16). Let's work together to get this sorted out.

To start, can you tell me if you see any specific error messages when you try to complete your order? Also, have you already tried any steps like restarting the app or your device?

While I wait for those details, here’s a straightforward step-by-step checklist you can follow to troubleshoot checkout issues on Android:

1. Update the App: Sometimes an outdated Subway app can cause payment problems. Go to the Google Play Store and check if there is an update available for the Subway app. If yes, update it.

2. Clear App Cache: Cached data can occasionally interfere with the app's functionality. You can clear the cache by going to Settings > Apps > Subway > Storage > Clear Cache.

3. Restart Your Device: A simple reboot can refresh your system and clear temporary glitches affecting the app.

4. Check Internet Connection: Ensure your device has a stable internet connection, either Wi-Fi or mobile data. Poor connectivity can interrupt checkout processes.

5. Review Payment Information: Double-check your payment details in the app to confirm everything is correct and that your card hasn’t expired or been declined.

6. Reinstall the App: If none of the above work, uninstall the Subway app completely, then reinstall it fresh from the Google Play Store. This can fix corrupted app files.

If you follow these steps and still can’t check out, let me know the exact point in the process where it fails, and any error messages you see. We can dive deeper from there or explore account-specific settings or payment method alternatives.

Does this sound good? Have you tried any of these steps already?
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