From Pathfinder Dark Archive (Remastered), which isn't enabled.

Sociable Vow

FEAT 4

Prerequisites Pactbinder Dedication; expert in Diplomacy

You can leverage your vow in more social interactions. The circumstance bonus from your Binding Vow also applies to attempts to Gather Information, Make an Impression, or Demoralize you make directly in service of fulfilling the vow.

Pathfinder Dark Archive (Remastered)ORC