code: public static Smartsheet createDefaultGovAccountClient() {
          String accessToken = System.getenv("SMARTSHEET_ACCESS_TOKEN");
          SmartsheetImpl smartsheet = new SmartsheetImpl(GOV_BASE_URI, accessToken);
          return smartsheet;
      }
docs: <p>Creates a Smartsheet client with default parameters using the Smartsheetgov URI.
  SMARTSHEET_ACCESS_TOKEN must be set in the environment.</p>
  
  @return the Smartsheet client