> We realized that users may enter the ZIP code associated with their personal address, instead of the code associated with their cards. To add clarity, we adde

> We realized that users may enter the ZIP code associated with their personal address, instead of the code associated with their cards. To add clarity, we added a note in a tooltip, which asks for the code from the credit’s card billing address. By the time some people start typing, they are looking at the keyboard and not at whatever is changing in the UI. The people who might need this tooltip won't be the ones to see it.