90% of the interchange fee. You are correct! Interchange fee for...

90% of the interchange fee. You are correct!

Interchange fee for Mastercard US Debit cards for unregulated debit seems to be around 0.9% + 15c.

DOU get 90% of the interchange fee, but also give approx 5c to Choice for each transaction (as per the prospectus). I'm assuming Choice get the other 10%?

So a $5 coffee would be 19.5c in interchange. 90% minus 5c goes to DOU, and 10% plus 5c goes to Choice.

So DOU gets 12.55c and Choice get 6.95c. 35% to Choice.

For a $100 transaction, DOU gets $0.895 and Choice gets $0.155. About 15% to Choice.

Hope my quick mafs checks out!