code: public String getAmazonCredentialScope(String dateStamp, String awsRegion, String awsService) {
          return dateStamp + SCOPE_SEPARATOR + awsRegion + SCOPE_SEPARATOR + awsService + SCOPE_SEPARATOR + AWS_REQUEST_VERSION;
      }
docs: Crates the amazon AWS credential scope (is represented by a slash-separated string of dimensions).
  
  @param dateStamp  Request date stamp. (Format: "yyyyMMdd")
  @param awsRegion  AWS region to which the request is sent.
  @param awsService AWS service to which the request is sent.
  @return A string representing the AWS credential scope.