The customs declaration is mandatory, you have the choice of doing it yourself or going through a freight forwarder in Douala. The freight forwarder is a specialist, who is able to advise you and support you during this process.
You want to make the customs declaration yourself. To do this, you can go to the Douala customs service and provide a set of documents. In addition, you must pay port handling fees.
If you choose to hire a freight forwarder, you will then have your representative with the customs authorities. He will make the necessary declarations for you. You can also commission him for all other transport services, such as managing the unloading of your load. It can also manage re-deliveries, within the country or elsewhere.