You make money when a pass sells: its price times the number of passes sold. The number sold is what takes the most work. It depends on the list of businesses, on your audience if you have one, and on how many counters agree to sell the pass.
Depending on what you agreed, each sale then pays a share to the participating businesses and a commission to resellers, plus the platform and payment fees. With Arsom, the platform costs an annual subscription plus a small commission per paid pass sold, quoted per project.
What’s left pays for the illustration, printing, promotion, professional advice and your time. Because the subscription is a fixed yearly cost, it takes a bigger bite out of each pass when sales are low. Base your estimates on a conservative sales volume before you promise the businesses anything.