MDCN Licences/Certificates/Service RRN Instruction For Payment Through The Remita Payment Platform All payments for MDCN Licences/Certificates/Services through the remita payment platform should be made using the GIFMIS Revenue Reference Numbers (RRN) listed below. Doctors are also advised to use the code for the closest location to them for payment. Thank you. GIFMIS REVENUE REFERENCE NUMBERS(RRN)