There is a dollar amount limit you can spend in a calendar year (I think it's $10,000) without giving them your checking account information, even if you pay off the credit card each month. If you spend more than the limit then they will insist that you become verified (allow them to get money from your checking account). Once you become verified, if your checking account has insufficient funds they will draw the difference from your credit card account.
If you spend $5,000 in a year, you get preferential assistance by them in handling problems.
As was mentioned in another post, if you suspect something isn't on the up and up, e-mail any suspiscious correspondence to
[email protected].
I had two suspiscious e-mails over the years. One of them was a bogus inquiry wanting my Social Security number among other things, and another was evidence that my security was compromised and at their suggestion I changed my password. You really have to watch after yourself.