Key or subscription: what you add in Happ
“Key” in search means server access. The client receives either one server line or a link to the whole list.
One config
The line usually starts with vless:// and names one server. If that server changes, the line dies and you replace it by hand.
That fits when you truly need a single node. A list is easier for everyday use.
Subscription link
An ordinary https address. Happ fetches the server list and can refresh it later. Renewing the term does not have to change the link in the account.
HappSales issues that link and a QR. The QR suits a phone or TV. The URL suits a computer.
What you pay for
You do not buy the app or an “official Happ VPN”. Happ is free and does not sell servers. You pay for a service subscription the client can open.
Price and device count are on the HappSales plan. After payment the link is in the account.