Often the numbers don't change on expired cards if the account is still active, and only the CCV and expire date are updated. Some purchases don't require CCV

Often the numbers don't change on expired cards if the account is still active, and only the CCV and expire date are updated. Some purchases don't require CCV to be entered, and the new expiration date can be guessed (probably an interval of 2 years or whatever for different cards). I know this from experience when I had the expired card in my wallet, and had forgotten to switch out for the new one when making an online purchase. Edit: cushman beat me to it