code: public static UserChannelFetcher fetcher(final String pathServiceSid, 
                                               final String pathUserSid, 
                                               final String pathChannelSid) {
          return new UserChannelFetcher(pathServiceSid, pathUserSid, pathChannelSid);
      }
docs: Create a UserChannelFetcher to execute fetch.
  
  @param pathServiceSid The SID of the Service to fetch the User Channel
  resource from
  @param pathUserSid The SID of the User to fetch the User Channel resource
  from
  @param pathChannelSid The SID of the Channel that has the User Channel to
  fetch
  @return UserChannelFetcher capable of executing the fetch