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What's the difference when asked for “debit or credit” by a store when using credit and debit cards?
Just to add about using debit card as "credit" vs "debit" way: In addition to the difference of having to enter the PIN when using "debit" mode (vs having to sign in "credit" mode), for stores that offer cash back (i.e. get cash out of your account at the same time as paying), you can only get cash back when using "debit" mode.