Trying to purchase credits for game my daughter plays and keep getting a Samsung checkout error that the purchase can't be completed. We have restarted the phone, uninstalled then reinstalled the game, reset the phone and tried on a different samsung phone but still get the same error. We reached out to the app developer and was told the the issue is with the samsung payment system and reached out to Samsung support but have not gotten any resolution.
Try uninstalling the game and installing it through the Google Play Store. This should allow you to make the purchase the Play Store rather than the Galaxy Store.