WordNet sense 1 (eliminate by paying off (debts)):

liquidate

WordNet sense 2 (pay someone with influence in order to receive a favor):

buy off

WordNet sense 3 (pay off (loans or promissory notes)):

redeem

WordNet sense 4 (do or give something to somebody in return):

compensate, pay, make up

WordNet sense 5 (take vengeance on or get even):

fix, get, pay back