Ranged and Melee Spell Attacks Question: Which Stat modifiers do spellcasters use?

[vale_73]

Hi everybody, a very simple question: which stat modifiers do spellcasters use when they roll a Ranged or Melee (Touch) Spell Attack ? I assume they use their Dexterity Modifier for Ranged Spell Attacks and their Dexterity or Strength Modifier for Melee Spell Attacks, but I'm not sure about this. I was wondering if they rather used their Spellcasting Stat Modifier, instead (Int for Mages, Wis for Clerics and Druids, Cha for Bards, Sorcerers and Paladins and so on).
Can you help me, and tell me when in the Playtest Rulebook this rule is written?
Many Thanks!

[Fuzzy-Wuzzy]

In the playtest you use your physical stat; "Spell Attacks" on page 197 is where it would say otherwise if you didn't (it just leaves it implicit in "make a melee/ranged touch attack").

However! One of the things we know about PF 2nd ed is that this has been changed to be the spellcasting stat. Also they dropped Touch AC, so the roll is made against, um, the target's Reflex DC I think?

I'm not sure whether things will work out with playtest monster stats if you use the final rules instead of the playtest rules, but you could give it a shot if not using the spellcasting stat bothers you.