My grandma has become easily confused and can no longer be trusted to make purchases, which she does on her tablet and phone (both samsung models). It's not in-app purchases, but rather actual online shopping purchases. Because of our family situation, I can't simply take away her card as she is responsible for managing the bank accounts. Is there some sort of parental control I can enable to prevent random purchases from random websites?
Added (1). Clarification: The impulse purchases are the least of the problem, it's that she's started clicking on random ads/banners that claim to be selling something and entering her information, which has started giving us random charges from random services because she clicked a random damn ad signing us up for god knows what.
Read more: How to stop someone from buying stuff on tablet? (NOT in app purchases)?