To process the fee in the age verification process, we use a secure 3rd party service to process this payment called Stripe. (https://stripe.com/)
In short: We do not store any payment info or process any payments through our own servers. Once you have age verified an account, you do not need to run through this process for that specific account again.
For more information on how to age verify your account, or what it means to be in a junior account, please read here.