code: public static StepFetcher fetcher(final String pathFlowSid, 
                                        final String pathEngagementSid, 
                                        final String pathSid) {
          return new StepFetcher(pathFlowSid, pathEngagementSid, pathSid);
      }
docs: Create a StepFetcher to execute fetch.
  
  @param pathFlowSid Flow Sid.
  @param pathEngagementSid Engagement Sid.
  @param pathSid Step Sid.
  @return StepFetcher capable of executing the fetch