Peruvian auto dealers should define the confirmation process for additional charges in the contract and internal authorization form rather than automatically accepting later invoices. For international freight, port services, document amendments, storage, inspections, or other potential items, require the service provider to explain the billing basis, reason incurred, and responsible party. Charges exceeding purchasing authority must receive written approval from finance and the responsible manager. Retain quotations, invoices, and proof of actual services for budget reconciliation. Destination-country duties, taxes, and procedures are subject to the applicable authorities, licensed service providers, and contractual terms. See Common Reasons Total Import Cost Exceeds the Vehicle Price.