What the setup link is

After a purchase (or the trial), the bot sends a message with a button — Set up my VPN the first time, Add a device once you are set up. It opens a link to litoravpn.com/claim/…; pressing the button on that page connects your Telegram purchase to a browser session, and takes you straight to choosing a device and location. To open the link on another device, long-press the button and copy it.

Three properties, all deliberate:

• It works once. A link that worked forever would be a password sent in chat. Once used, it is spent.
• It lasts about a day. A stale link in an old chat should not be a live key to your access.
• Losing it loses nothing. Your access belongs to your Telegram account. Send /link to the bot and a fresh link arrives.

Do not use a setup link somebody else sent you: whoever redeems the link gets connected to that buyer's access, and the rightful owner can see and revoke the devices it creates.