not if you paid me
Not for anything; under no circumstances. Said of things one would normally pay to do or else do for free. I wouldn't fly with that airline again if you paid me! A: "Would you mind looking after my kids this weekend?" B: "Those two little terrors? Ha, not if you paid me!"
not if you paid me
Under no circumstances, as in I wouldn't jump off the high diving board, not if you paid me. [Late 1800s]