I started using my passport but then was told by a WU agent that it wasn't accepted and I had to use my DNI, but that was for a cash pickup not a bank transfer. I use my DNI now. I imagine it is different depending on whether you are here as a tourist or a permanent resident...I just opened a bank account here with my DNI - not you have me worried. Should I be using my passport or DNI when making transfers via western union?