My new scenarion in this kind of situation: I did a job for a client. Conditions was this: $750 down payment to begin the job. $790 transaction after setting up sprinklers and trimming tree's. Last transaction of $850 compensated after realization barrier + transaction for all components. The client said my craftsmanship is amazing, has no issue at all with my perform, very pleased. However, she says the ultimate transaction of $850 will be compensated upon beginning of the next job (which there is no next job, and this is not mentioned in the contract) and she will not pay for components of the barrier.