there's not much to see except a google form for signups and gumroad link for payment. it only has glacier national park configured right now.
the notification system is a github action that runs constantly, scraping the api that makes the reservation.gov permits, and then checking if any of the subscription notifications have changed.
the sign up is a google form that triggers a zapier and adds the new notification subscription to a google sheet. the spreadsheet is used in the github action. the zapier also sends an email with a payment link to the user.
you sign up here: https://forms.gle/eftvBZwapnQb8RmT8
and that sends you a link to pay: https://smcalilly.gumroad.com/l/qxvph
and then it's setup.