Hey @Liamk,
Thanks for getting in touch!
This is an interesting one - I don't have an exact solution for you here, but I can speak generally about what may be causing this issue.
Because Square allows for PIN entry via your mobile touchscreen, we require an ultra-secure operating environment to process payments on our app. You'll generally receive this message if our app detects an operating environment that falls below our device security standards, either due to the way other apps operate or due to the way the Android OS may have been modified to work on a particular device.
The message you are seeing is often related to apps that use "Screen Overlay", meaning they are able to manipulate how your device's screen operates while other apps are running. You might want to try tuning off screen overlay on all apps that use it - this won't prevent these apps from operating when open, but it will mean they won't be able to access your device's screen while Square is open.
Hope this helps - I can't guarantee this is going to solve the issue (sometimes it's due to the way Android has been customised on a given device), but let me know how it goes.
Seamus
Square, Australia
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