Extreme Exporters from Markham, Ontario sells products to Monseigneur Imports in Miragoane, Haiti. The shipment is one 40' ocean container with 20 wooden pallets. The terms of delivery negotiated are CPT, Port-au-Prince, Haiti Incoterms 2010. The buyer has an open account with Extreme Exporter with 60 days to pay. Customs clearance at the arrival port was delayed incurring in the demurrage cost of USD $500. Who is responsible to pay? Explain.