There aren't any systems like that in Pathfinder. You would have to develop something from the ground up as far as I'm aware.
Not even 3rd party stuff? Drat.
Maybe I can alter an existing magic system. Words of Power perhaps?
It seems like this is probably going to be unbalanced or not meaningful. The game is balance around free, limited spells per day. If you slap a cost on, the cost either breaks the balance (unless applied to all casting), the compensating benefit breaks balance, or it isn’t a “real” cost.
Refluff options: material, somatic, and verbal components are the cost. By providing materials meaningful or useful to spirits, tracing inscriptions granting them better access to this realm, and reciting short verses honoring them or things they care about, one provides offerings to invoke various spirits. These invocations also reference various payments made beforehand. For instance, d6 casters have given up much of their vitality in various deals, and divine casters are being repaid for lives spent in service of their patrons. Eschew Materials represents some lump sum payment or an account spirits draw from- possibly even one built up by an ancestor and inherited. Mediums already bargain with spirits, and Kineticist works pretty well for paying with vitality.
I'll add in that SoP also has a 'skill based casting' drawback for a tradition. If you are thinking of deals with spirits, requiring diplomacy or something as a skill would be workable.