Payforit.net has changed to Payschoolscentral.com. Your current login information should have transferred to the new site. If you have not logged into Payforit.net for a while you may be required to update your password before logging into Payschoolscentral.com. All balances should have transferred as well.
You will also have to update to the new Payschoolscentral app, which is now available on both Android and iOS. The Payforit.net app no longer works.