You can invoice SOS International a/s through Tradeshift if you have received an invitation. The invitation will hold all the necessary information. You will receive this invitation from Tradeshift on behalf of SOS International a/s. You can also create an account on Tradeshift and search for SOS International a/s and request a connection. When the connection has been approved by SOS International a/s you can send your invoice via Tradeshift.