code: function setGlobalVariable(key, value) {
          return _execute('PUT', '/variables', {
              key: key,
              value: value
          }, 'Could not add or update variable key [' + key + ' with value [' + value + ']');
      }
docs: Add or Updates the given global key/value pair so it is accessible for when the response will returned.
  @param key The key.
  @param value The value.
  @return {Promise} the promise.