I see that to perform on-line transaction with credit (or debit) card you usually need 3 pieces of information
- Card number
- Expiration date
- Security code
Some merchants offer option to store payment method for later use. What is stored then as usual practice and what merchant can do with this data without card holder supplying the rest?
The source of this question is my observation that if I save my debit card transaction as a payment method the subsequent uses are not authorized by my bank. I expect that
- They are not saving everything
- They expect the information saved do be enough for bank to authorize transaction
- They are expecting it to be enough because they are not asking me to supply the rest
My guess is that it may be difference between credit and debit card handling.
This is rewrite of question to get better answers so the comments may refer to original form of the question.