consideration
thing provided by both parties it must be real and of value (chappel v nestle)
performance of existing duty
(Stilk v myrick)
exception- doing something extra (heartly v ponsoby)
past consideration
ReMcArdle
exception- implied promise to pay (lampleigh v Braithwaite)
part payment of debt
pinnel
exceptions:
accepting something other than money
paying earlier than date