Update portal ext property

Use below script to update portal-ext property. Change property name which you want to update

import com.liferay.portal.util.PropsUtil;

String google = PropsUtil.get("metatag.google.site.verification");

out.println("google: - "+google);

PropsUtil.set("metatag.google.site.verification","abcdpqrsxyz");

google = PropsUtil.get("metatag.google.site.verification");

out.println("google: - "+google);