If the OPay app crashes immediately upon logging in, follow these steps to troubleshoot and resolve the issue:

1. Restart the App: Close the OPay app completely and reopen it. Sometimes, a simple restart can resolve temporary glitches.

2. Check for App Updates: Go to the Google Play Store and check if there are any available updates for the OPay app. Updating the app can fix bugs causing crashes. Search for "OPay" in the store and install any updates if available - learn more.

3. Clear Cache and Data:
- Navigate to Settings on your device.
- Select Apps or Application Manager.
- Find and tap on OPay.
- Choose Storage and then click on Clear Cache. If the problem persists, you can also click on Clear Data. This will reset the app to its original state - learn more.

4. Reboot Your Device: Sometimes, a device restart can fix underlying issues affecting app performance. Turn off your phone and then turn it back on - learn more.

5. Reinstall the App: If the above steps do not work, uninstall the OPay app from your device and download it again from the Google Play Store. This can help if the app files have become corrupted - learn more.

6. Check Internet Connectivity: Ensure that your internet connection is stable. You might want to switch between Wi-Fi and mobile data to see if either provides a better connection.

7. Contact Customer Support: If none of the above solutions work, you may need to reach out to OPay's customer support for further assistance. They can provide specific guidance related to your account or device - learn more.

Following these steps should help you troubleshoot the crashing issue with the OPay app.