If the UK ETA app froze when you tried to click over to see the confirmation text code for authenticating a payment, follow these steps:

1. Check Internet Connection: Ensure your device has a stable and strong internet connection. Fluctuating connectivity can cause the app to freeze during transactions. You can try switching between Wi-Fi and mobile data to see if that resolves the issue.

2. Force Close the App:
- On your Windows device, right-click on the taskbar and select Task Manager.
- Locate the UK ETA app in the list of running applications.
- Select it and click End Task to force close the app.

3. Restart the App: After force closing, reopen the UK ETA app and try to navigate back to the payment section.

4. Check App Permissions: Make sure the app has all necessary permissions to send notifications. Go to the app settings and check for notification permissions.

5. Clear App Cache: If the app continues to freeze:
- Go to Settings on your device.
- Navigate to Apps and find the UK ETA app.
- Click on Storage, then Clear Cache. This may help fix temporary glitches in the app.

6. Update the App: Ensure that the UK ETA app is updated to the latest version. An outdated app can lead to performance issues:
- Visit the Google Play Store to check for any available updates.

7. Re-login: After updating or clearing the cache, log out of your account and log back in to refresh your sessions.

8. Check for Alternates: If the above steps do not resolve the issue, consider using a different device or accessing the UK ETA service via a web browser instead of the app.

9. Seek Support: If you still face difficulties, you can consult forums or community pages, such as the UK visa subreddit or any official UK government sources.

Addressing payment or authentication issues can sometimes be tricky, and many users have reported similar problems. Reaching out for assistance from the UK ETA support might provide additional help.

If issues persist, please consider checking the relevant threads on platforms like Reddit, where many users share their troubleshooting experiences, such as the thread on UK ETA Wont Accept My Payment - learn more or other related discussions.