"Stripe is asking me for verification to complete my purchase! What does that mean?"
If you've selected the 'Remember Me' option when making a purchase in the past, it will have had you enter a phone number to receive a text message confirmation for each future purchase. When you go to make a purchase, it will ask you to verify your account by sending a text message to the number you entered, and you will then enter that number on the site. The pop-up box will look like this:
If you can't remember the number you entered or entered a number that doesn't have texting capabilities, you can wait a few moments and the information at the bottom of the box will change. It will then look like this:
Please click on the "Fill in your card details manually" link to fill in your card information and complete your purchase without having to receive a code for verification.