South African contracts are usually JBCC, NEC or FIDIC. There is no statutory security-of-payment regime, so the payment cycle and the dispute timetable come from the contract itself rather than from an Act. VAT applies at 15%, and the certificate rather than a statutory notice drives payment.
Not your whole portfolio. One live job, one certificate. If it does not save you time the first time you use it, walk away and take your data with you.