is there any way to put restrictions on what can be purchased with a credit/debit card?

by eyewash
Question by ashley j: is there any way to put restrictions on what can be purchased with a credit/debit card?
my grandfather is in his 80's and after open heart surgery last year, his mind has gotten worse. he orders all this junk from infomercials that he doesn't need and it's just a waste of money. so much that my dad has canceled my grandfather's credit cards, but he thinks he can still use them. last night my husband and i took my grandfather out to dinner. we were in his

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