So I work at a chocolate company and get an employee discount. A local coffee shop I frequent wants to buy chocolate from me directly rather than from the source because they don't want to buy the minimum order of 500lbs at a time (this is a small coffee shop). They offered to give me free coffee as compensation, but should I ask for like a commission fee or something? If so, how much? I'm not really experienced with this kind of stuff.

Thanks in advance