Classpop! asks for your billing information in case the amount of the selected experience is more than the amount on your gift card. This allows us to ensure hosts are compensated if you invite additional guests to join your experience, if the experience is made private for a fee exceeding the value of the gift card, etc. The security of your information is our top priority. Classpop! works with a PCI compliant payment processor, the most stringent level of certification available in the payments industry.