One trick I have seen online merchants use is to credit a prospective customer's account a small sum of money, like $1.16. Then call the customer and ask them to tell merchant the amount that was added. If the customer has full access to the account, customer can answer the question. If the credit card is stolen, the customer will not know the amount merchant credited.
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One trick I have seen online merchants use is to credit a prospective customer's account a small sum of money, like $1.16. Then call the customer and ask them to tell merchant the amount that was added. If the customer has full access to the account, customer can answer the question. If the credit card is stolen, the customer will not know the amount merchant credited.