The monthly invoice package the contractor submits to request payment for completed work.
A payment application (pay app) is the formal monthly invoice submitted by a contractor to the owner or construction lender requesting payment for work completed and materials stored during the billing period. It includes a completed schedule of values (typically AIA G702/G703), conditional lien waivers, stored material documentation, and any approved change orders. The architect certifies the amount due before the owner releases payment.
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