LETTER OF MANDATE for NRI Account Holders. Place ______. Date ______. To,. The Branch Manager. HDFC Bank. ______ Branch. Dear Sir,. Re: Mandate to operate ...FOREIGN PASSPORT HOLDER. ▫ Photocopy of OCI (Overseas Citizen if India) card / PIO (Person of Indian Origin) card / PIO Declaration wherever ApplicableI (Name). declare that I am a Person of Indian. Origin (PIO) because I satisfy one of the following conditions: (Please select from the below).