Ask HN: Are you still typing in your credit card number to shop online?

Over the years, there have been many alternatives offered to the clunky process of entering in your full credit card information every time you buy something online. But to this day, I do it whenever I am shopping at a new site. (Sites where I shop routinely, such as Amazon, have my information on file.) I just haven't found a reliable alternative.

What do you use?