code: function init(app) {
      app.post('/api/v1/connectors/:connection', 
      /**
       * installs session data such as credentials.
       *
       * @param req containing body JSON to pass as input.
       * @param res result of call is provided as JSON body data.
       * @param next function to invoke error handling.
       */
      function serviceCall(req, res, next) {
          connector.configureSession(req.params.connection, req.body);
          res.send(204); // success --> 204 no content
      });
      app.post('/api/v1/connectors/:connection/:call', 
      /**
       * calls directly into a service connection.
       *
       * @param req containing body JSON to pass as input.
       * @param res result of call is provided as JSON body data.
       * @param next function to invoke error handling.
       */
      function serviceCall(req, res, next) {
          connector.runCall(req.params.connection, req.params.call, req.body).then(res.json.bind(res), next).done();
      });
  }
docs: module providing direct access to connectors.
  
  Used by Relution SDK connectors module for direct access to backend servers. If you do not want
  or need this functionality, the routes defined herein can be removed.
  
  @param app express.js application to hook into.