Considering this scenario,
At coffee bar you order the drink and get bill for that,
On bill there is key for Wi-Fi network which is going to be valid for next X hours.
I want to try realize something like that. Where to start looking,
Does PfSense have that in box ?
Should I left wireless network open and do authorization on internal site for allowing go users to go out ?
I am confused How I can pull or generate KEY pragmatically by C# (.NET) (that is language I know).