1) Be due a refund 2) Compensate in a way 3) Deserve credit 4) Get gouged 5) Get soaked 6) Give cash to a scalper 7) Give too much for 8) Give too much money 9) Give too much to 10) Pay too much 11) Remunerate excessively 12) To hand over too much money 13) To pay too much 
Credit: Julius Cruickshank Fetish market in Lomé, Togo. ...
• (v. t.) To pay too much to; to reward too highly.
O`ver·pay' transitive verb [ imperfect & past participle Overpaid ; present participle & verbal noun Overpaying .] To pay too much to; to reward too highly. 
[v] - pay too much
to pay more than (an amount due): I received a credit after overpaying the bill. · to pay (a person) in excess.