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Adjustment
A financial modification to a billed amount: credit, discount, fee, tax
Affidavit
Formal attestation that spots aired as scheduled
Credit memo
Document adjusting a previously issued invoice downward
ERP
The enterprise financial system holding invoices and receivables
Proof of performance
Evidence that advertising actually ran
Subledger
The detailed billing record supporting the general ledger
True-up
A later adjustment reconciling preliminary billing to final settlement