lib/card.js
function (err, params) {
                if (!err) {
                  callback && callback(null, params);
                }
                else {
                  callback && callback(err.message || err);
                }
              }
function (err, params) {
                if (!err) {
                  callback && callback(null, params);
                }
                else {
                  callback && callback(err.message || err);
                }
              }
function ( err , params ) { if ( ! err ) { callback && callback ( null , params ) ; } else { callback && callback ( err . message || err ) ; } }
done - respond with params
done - respond with params