Happ key on iPhone
On iPhone the client comes from the App Store. HappSales does not ship its own installer. You add the link or QR from the account.
Install the client
In the App Store the app is Happ - Proxy Utility. Skip other builds that reuse the name.
Paste the link
Copy the whole subscription URL from the account, with no trailing space. In Happ tap “+” and paste from the clipboard. iOS asks for clipboard permission — allow it.
For a second device, scan the QR in the account instead of forwarding the long line.
Connect
Wait for the server list and enable the tunnel. The system asks once for VPN permission. If the list is empty, the link was probably cut off or the term has ended.