How should I remind my boss he owes me money?

Anonymous
Today he wanted me to run a completely unnecessary errand by bringing books a client of ours wrote to a show in a different part of the city. I made a point to ask for a card because I am not going to spend my money on a company errand out of principle. He gave me his card but there wasn't much on it, and told me to put $30 on it and he would pay me back. If he forgets to give me $30 tomorrow (He is supposed to give me my check then too) How should I remind him? I was just going to say, By the way, could I get the $30 from the metro card now?"
How should I remind my boss he owes me money?
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