code: function (deviceIdentifier, data) {
        var path;
        if (deviceIdentifier) {
          path = this.constructPath(constants.DEVICES, deviceIdentifier, constants.IDENTIFIERS);
          return this.Core.POST(path, data);
        } else {
          return this.rejectRequest('Bad Request: A device identifier and a data object are required.');
        }
      }
docs: Create an identifier for a device
  @param  {String|Integer} deviceIdentifier A Robin device identifier
  @param  {Object}         data             A querystring object
  @return {Function}                        A Promise