I have 4 years experience in Corporate Branding, Identity & Stationary, and have done work for similar companies in the same industry.
From looking through your Facebook page I see your corporate colours are black and orange, with simple minimalist white text
I propose a matte black background with orange and white text, as to tie in with the rest of the business.
Just a quick idea, the first thing that popped into my head,
FRONT
Company logo and contact info same like what would be a standard business card
INNER LEFT
Coffee space.
INNER RIGHT
Sundae space.
BACK
Space for customer details, include email field, allows you to compile a mailing list from these.
I hope to heard from you
Regards
Matt