Hi there! Sorry to hear you're having trouble submitting your application after payment in the AustralianETA app. Let's get this sorted out together.

To help me better understand, could you tell me:

1. Are you using the AustralianETA app on your Windows device or through a web browser?
2. Did the payment go through successfully (e.g., was it confirmed on your bank or card statement)?
3. Have you tried submitting the application again after a short wait or restarting the app?

In the meantime, here are some steps that often help fix this error:

1. Check Your Internet Connection: A stable connection is needed for the application to submit properly. Try switching between Wi-Fi and mobile data or restarting your router.

2. Clear the Browser Cache (if using browser): Sometimes stored data can interfere. In your WebKit-based browser, clear cache and cookies and then try again.

3. Update the App or Browser: Make sure you are using the latest version of the AustralianETA app or your browser.

4. Avoid Duplicate Submissions: If the payment succeeded but the app didn't register it, the system might block resubmissions. Check your email for any confirmation of submission.

5. Try Submitting from Another Device or Browser: This will help determine if the issue is device- or app-specific.

If after trying these you still see the error, there might be a temporary technical issue on the backend. In that case, you can email the AustralianETA support team at [email protected] to explain the issue and provide your payment details safely.

Let me know how these steps go, and if you need further help! Are you satisfied with this solution so far?