Hi there! I understand the HeyCash app is showing a black screen and is not loading properly. Let’s work through some steps to resolve this.

1. Restart Your iPhone: This is a simple but often effective solution. Press and hold the power button and the volume down button together until you see the Apple logo, then release the buttons.

2. Check for Updates: Ensure that both your iPhone's iOS and the HeyCash app are up-to-date.
- Go to Settings > General > Software Update to check for iOS updates.
- Open the App Store, tap on your profile picture, and scroll down to see if updates are available for the HeyCash app.

3. Reinstall the App: If the problem persists, try uninstalling and reinstalling the HeyCash app. You can do this by:
- Long-pressing the HeyCash app icon on your home screen and selecting Remove App > Delete App.
- After that, go to the App Store and download the HeyCash app again.

4. Clear App Cache: The app may have some corrupted data that’s causing it to fail. Unfortunately, iOS doesn’t allow us to clear cache for specific apps, but reinstalling does achieve a similar outcome.

5. Check Your Network Connection: Make sure you have a stable internet connection. Try switching between Wi-Fi and mobile data to see if that helps.

6. Login Issues: If you’re experiencing an issue related to account data (like showing no credits), there might be a deeper account issue. In such a case, it could help to contact HeyCash support for assistance more specific to your account. You can reach them at [email protected].

If these steps don't resolve your issue, I will look into additional resources. Are you comfortable trying these steps?