i don't think the person paying gets to dictate absolutely everything, nor do i think you have to bow to the decisions of the payer.
i don't think saying "no" to the payer automatically equals "i'm not paying for anything, then!"
if the payer is the kind of person who would pull payment over any of the petty, stupid disagreements we see here every day, then the op probably has an inkling that the person was never going to be happy, or never going to pay.