How do I submit a PO or check? December 05, 2024 21:59 Updated You can email POs to ar@diffit.me. You can mail checks to: DIFFIT BILLINGPO BOX 842148LOS ANGELES, CA 90084-2148 Related articles How do I request a quote? Where can I find Diffit's W9? What happens when my trial is over? How to get started on Diffit How to invite teachers to your Diffit subscription