Expressway comes with a set of extensions to be added on the System Applications and Products (SAP) Commerce side to enable this point-to-point Integration between Commerce and Marketing systems. Expressway gets deployed with SAP Commerce application. People skilled in SAP Commerce can easily work on Expressway based Integration.
It is important to note that Expressway is not a standard Integration solution and is not officially supported by SAP. However, it can be a useful option in certain situations when there are constraints around time and cost.