As a carrier we need the VGM for containers from our shippers. The API is one of the methods to provide a VGM to Transfennica. With the API you can submit a single VGM or batches for a single booking reference. As VGMs need to be reported in time before the vessel departure, the API will also inform you when the VGM can't be processed anymore.
Sign up for a developer account and you can request full access with dedicated API keys to explore the VGM API.