Strange error message Galaxy S8+

[DannyDaEpic]

Doesn't cause any problems just keeps appearing randomly while using applications and I'm curious as to what it is. (Shown at bottom of screenshot.)

Thanks for any help. 

[BandOfBrothers]

I've not seen this pop up on my N10+ @DannyDaEpic 

Could be Samsung Pay / Google Pay or an app.

I'd put the phone in Safe Mode which disables any downloaded apps and leaves the stock ones working and then see if it pops up or not.

If it stops then come out of Safe Mode and start deleting your most recent apps one at a time until it stops.