1 character v 1 character
You pick the same GP opponent from a list
You pick the characters
You can't see their locked in mods, and they can't see yours.
You place the wager.
They have 24 hours to accept or decline and battle before all wagers are reset.
If they win they can keep going through the list of wagers, so if they have done everything else that day then they have something to do.
This is actually something straight-up in-line with the idea of having a player vs. player holotable in a cantina.