Hi there! I understand you're encountering the "Oops, something wrong" error when trying to log into your PayMe app on your iPhone running iOS 18.7. Let's try to get this sorted out together.

To start, can you tell me if this error shows up right after entering your login details? Also, have you recently updated the app or your phone's iOS? Knowing these details will help me pinpoint the cause.

Meanwhile, here are some initial steps to try:

1. Check your internet connection: Make sure you have a stable Wi-Fi or cellular data connection.

2. Restart the app: Fully close the PayMe app and reopen it.

3. Restart your iPhone: Sometimes a simple reboot clears temporary glitches.

4. Update the app: Go to the App Store, check if there's an update available for PayMe, and install it.

5. Clear app cache (if possible): iOS does not have a direct cache clear, but uninstalling and reinstalling the app can help clear residual data.

If you’ve already tried any of these, please let me know so I can suggest more advanced troubleshooting steps. Also, if you see any error codes or additional messages along with “Oops, something wrong,” that info would be helpful!

Looking forward to your reply so we can get you logged in smoothly.