Barter

Barter is a general skill used to argue any deal.

Save is Users Focus + Barter Levels + 1d20 vs targets Awareness + Barter Levels + 1d20

A dm may modify either side of the challenge depending on circumstance. The target may have a deep hatred for the user resulting in a +5 for the target, or the user may have a reputation for honesty and fairness giving him a +5.