docs: function (settings) {
  
      let out = '';
      if (settings.securityDefinitions) {
          Object.keys(settings.securityDefinitions).forEach((key) => {
  
              if (settings.securityDefinitions[key]['x-keyPrefix']) {
                  out = settings.securityDefinitions[key]['x-keyPrefix'];
              }
          });
      }
      return out;
  }