You must deliver the goods available to the buyer with the right transport, ready for unloading and at destination. You must pay export tariffs, but not import tariffs. In turn, the seller must contract for carriage of the goods to the destination and download them upon arrival. It must provide the buyer the document that allows you to receive the goods, without obligation to purchase insurance.
You must pay the price of the goods as provided in the contract of sale, and receive the goods as soon as they have been delivered.