a trading company can act in four different ways

Sales agent for those exporters that are domestic. The trading company establishes the marketing presence in foreign markets soliciting orders from foreign customers in the name of the manufacturer. Invoicing is done on the name of the manufacturer and helps the exporter with all details of the export transaction. The trading company may suggest the export price, but this principal has the final say on even whether to accept the order. The relationship with its clients is established through a International Commercial Agency Contract.
Buying agent for importers that want to buy a specific kind of products within a specific territory that can be a country or multiple countries well known by the trading company. The responsibilities of the trading company may include, among others: identifying manufacturers and suppliers of products within the described territory; negotiating prices, terms of delivery and payment; and managing the international transport of documents which comply with export and import procedures. The relationship with its clients is established through a International Buying Agent Contract.
Exclusive distributor on a buy-sell basis. The trading company buys a manufacturer at a set price and resells to foreign customers at a price established by itself. When the trading company is acting as a distributor, the manufacturer may have no control over the export price and not even know the foreign clients are. The relationship with its clients is established through an International Distribution Contract.
Intermediary in specific trade operations in which does not act as a buyer or seller but as an intermediary that charges a commission on export and import operations. The relationships with its clients (usually the exporter/sellers) are established through an Intermediary Contract for Trade Operations.