How to invite a friend to a match?

Hi,

so I am done with my little android-game with PUN2, where 2 players can play against each other.
Now I want a functionality where a player can send a match-invitation to a friend (via whatsapp, snapchat, telegramm,etc). When the friend clicks on the link the game-app needs to open and a specific room needs to be joined. So I need the shared link to contain a variable in the URL for identification.

Is this possible? If so, how would I do that? If not, how could I achieve at least somewhat where 2 specific fiends can play against each other?

 

Aside from the room name, you should also send the region along, so matches work also for friends who don't use the same region otherwise.

I guess you could encode this simply into a link to the app. How that's done, depends on the platform (I guess iOS and Android) and I can't really help with that...