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Why don't banks allow more control over credit/debit card charges?
Actually in Finland on some bank + debit/credit card + online retailer combinations you type in your card details as you normally do, but after clicking "Buy" you get directed to your own bank's website which asks you to authenticate yourself with online banking credentials. It also displays the amount of money and to which account it is being paid to. After authentication you get directed back to the retailer's website. Cannot say why banks in US haven't implemented this.