Discount for payment by check/cash

Discount for payment by check/cash

I am a month into using Zoho Invoice now. I linked payments to my Paypal account as a nice option for my clients to pay me more quickly. I was not prepared to see how much 2.9% + .30 was adding up. What I want to do is factor this fee into my rate but provide a discounted rate if they are paying by check or cash. I understand that you can do discounts on a per invoice level but can you provide a more automated method where the client understands what the discounted fee will be should they choose to pay by check?