Some definitions for your consideration

extortion
|ikˈstôr sh ən| noun:
the practice of obtaining something, esp. money, through force or threats.
DERIVATIVES extortioner noun: extortionist |-ist| noun ORIGIN Middle English : from late Latin extortio(n-), from Latin extorquere ‘wrest’ (see extort ).

extortionist
noun; racketeer, extortioner, extorter, blackmailer; informal: bloodsucker, vampire.

Thesaurus
extortion noun: arrested on a charge of extortion
blackmail, shakedown; formal exaction.

incentive
|inˈsentiv| noun: a thing that motivates or encourages one to do something : there is no incentive for customers to conserve water • a payment or concession to stimulate greater output or investment : tax incentives for investing in depressed areas | [as adj. ] incentive payments. ORIGIN late Middle English : from Latin incentivum ‘something that sets the tune or incites,’ from incantare ‘to chant or charm.’

Thesaurus
incentive noun: only financial incentives will curb the polluting activities of major industries
inducement, motivation, motive, reason, stimulus, stimulant, spur, impetus, encouragement, impulse; incitement, goad, provocation; attraction, lure, bait; informal: carrot, sweetener, come-on. antonym deterrent.

bribe
|brīb| verb: [ trans. ] persuade (someone) to act in one's favor, typically illegally or dishonestly, by a gift of money or other inducement : an undercover agent bribed the judge into giving a lenient sentence | [ trans. ] you weren't willing to be good to your sister without being bribed with a lollipop. | [ intrans. ] he has no money to bribe with.
noun: a sum of money or other inducement offered or given in this way. DERIVATIVES bribable adjective briber noun ORIGIN late Middle English : from Old French briber, brimber ‘beg,’ of unknown origin. The original sense was [rob, extort,] hence (as noun) [theft, stolen goods,] also [money extorted or demanded for favors,] later [offer money as an inducement] (early 16th cent.).

Thesaurus
bribe
verb: pay off, suborn; informal: grease someone's palm, fix, square. noun: she accepted bribes
inducement, incentive, payola; informal: payoff, kickback, boodle, sweetener.

extortionist
noun; racketeer, extortioner, extorter, blackmailer; informal: bloodsucker, vampire.