I purchased my first Kindle on Amazon using my credit card, as I like to perform the majority of online purchases with a credit card for a feeling of more online security. However, I don't like charging to my credit card and would prefer a direct debit because I find I spend more realistically in that manner, i.e. don't overspend, know what I've spent, etc. Do you think it's just as safe to use a debit card for my 1-Click transactions? Thanks.