How about the meal card of Fudan University in Shanghai?

Temporary deduction of 20% for off-campus personnel, 5% for temporary cards for on-campus personnel (security, property management and leasing personnel), and no deduction for student cards for on-campus personnel.

Temporary cards for off-campus personnel can be handled casually, just at the card office at the entrance of the canteen. Other cards that need to be processed.

Temporary card for off-campus personnel 100 yuan, actually spending 80 yuan, deducting 20 yuan as management fee.