On the iPhone, the apps you download from the App Store are updated automatically by default. However, if there is a problem that is resolved in a new version, you can do it manually.
1. Launch the App Store.
2. Select your profile icon at the top of the screen.
3. Scroll down to see pending updates and release notes. Tap ‘Update’ next to the payzy app to update this app only or tap ‘Update All’ if you want to update all apps.
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If you want to make sure that the application is automatically updated, then you will need to:
1. Go to Settings.
2. Choose ‘App Store’.
3. Enable or disable the ‘Application updates’ option.
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If the application cannot be updated, make sure you have sufficient storage space on your device and that you have rebooted.