Transfer a spot in a game to another user
So, if you want to give your spot in a game you've paid for, a nice feature would be to be able to transfer your spot to another user, in case you can't make it but you can find someone to replace you.
So if user A has the spot reserved and user B wants to replace him:
User A should set his spot 'on sale' (maybe this is not the best term). This will allow for a future expansion of this feature, and would help with avoiding sending too much invitations as spam
Once user A has set that spot 'on sale', user B can send an invitation to replace user A for that match.
User B should have enough credit available to send the invitation
If user A accepts the invitation, he is removed from the match list and user B gets added in his place
This would help the matches to get full assistance while not giving away any revenue