code: public String getFor(String personalIdentificationNumber) {
          for (RedirectUrl redirectUrl : urls) {
              if (redirectUrl.signer.equals(personalIdentificationNumber)) {
                  return redirectUrl.url;
              }
          }
          throw new IllegalArgumentException("Unable to find redirect URL for this signer");
      }
docs: Gets the redirect URL for a given signer.
  @throws IllegalArgumentException if the job response doesn't contain a redirect URL for this signer
  @see DirectJobResponse#getSingleRedirectUrl()