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