The Excessive Zahir from Currency Exchange

Question
Some customers need to exchange coins to get the right currency to use in machines, and sometimes they do not count their money correctly and only have 99 qirsh. Can I give them a dinar without asking for a qirsh, or would this be considered usury? Is it permissible to give a customer a qirsh later, or should it be immediate?
Answer
I say, and with God's help: It is permissible to reduce in such an exchange, and it is considered a donation, not usury. If the customer returns it later, it is permissible as a loan, and God knows best.
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