To resolve the issue where the Murphy Drive Rewards app blinks and won’t open, follow these step-by-step suggestions:

1. Force Close the App:
- Double-press the Home button (or swipe up from the bottom of the screen if you have a newer device) to bring up the app switcher.
- Locate the Murphy Drive Rewards app and swipe it up to close it completely.

2. Restart Your Device:
- Power off your iPhone by holding down the side button until the "slide to power off" option appears.
- Slide to turn off your device.
- After your iPhone is off, wait a few seconds and turn it back on by holding the side button again until the Apple logo appears.

3. Check for App Updates:
- Open the App Store on your iPhone.
- Tap on your profile icon at the top right of the screen.
- Scroll down to see if updates are available for the Murphy Drive Rewards app. If it is listed, tap on "Update".

4. Reinstall the App:
- If the above steps do not resolve the issue, uninstall the Murphy Drive Rewards app.
- Press and hold the app icon until a menu appears, then select "Remove App" and confirm deletion.
- Go to the App Store, search for "Murphy Drive Rewards", and reinstall it.

5. Check for iOS Updates:
- Go to "Settings" on your iPhone.
- Navigate to "General" and then tap on "Software Update".
- If any updates are available, download and install them.

6. Clear App Cache (if applicable):
- Unfortunately, iOS does not allow you to clear cache for apps directly. Reinstalling the app usually helps clear stored data that might be causing issues.

7. Contact Support:
- If none of these methods work, you can check for additional support or forums dedicated to the app. It may also be beneficial to visit Murphy USA’s help page: learn more - learn more.

By following these steps, you should be able to get the Murphy Drive Rewards app functioning properly again. If the issue persists, further assistance may be required from either Murphy Drive customer service or Apple support.