A progress payment is an invoice issued for a portion of the job, typically based on reaching certain milestones.
A variation is a change to the job specifications or scope. For example, if the initial reference is 2803, a variation might be denoted as 2803A.
Retention is the practice of withholding a portion of the payment, typically for a specified period (e.g., 6 months), as outlined in the contract. This is done to ensure there are no issues with the work completed.
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