Create an automated license key service that creates a user on my server for vpn

I currently have a server that is running pritunl client. I am able to manually add people to my server, but this will be quite inefficient. Right now, i have to manually create someone's profile, send them their pin and profile file. I have made a website: [login to view URL], where people can buy vpn services, powered by paddle. I would like to have it so when someone buys through the link, a license key is automatically sent to their email they used to purchase the subscription. Once they do this, they can use the form to put in their email and license key, and a profile will automatically download, and their pin will be emailed to them.