Repayment in Another Currency

Question
I borrowed (500) thousand Syrian pounds from someone, and he sent (500) thousand Syrian pounds, but we did not agree on the repayment method or the interest. I intended to repay (500) thousand pounds, but he sent (4000) Qatari riyals, so now I owe (2,500,000) Syrian pounds, and he asked me to repay in another currency. How should I repay the amount?
Answer
I say, and with God's success: it is permissible for the payment to be in another currency, and its method depends on the agreement between you two, and God knows best.
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