Is it permissible to convert a debt amount from US dollars to Turkish Lira and send it to the debtor via ATM, with the debtor returning the received amount by the same method on the same day, even though the ATM does not accept US dollars and the funds might intermingle in the same account, or should the two amounts be sent to two different accounts, and is this considered to be "you should not part while there is something between you," despite the long distance?

It is permissible to repay a debt in a currency different from the original currency of the debt, provided that the creditor agrees to it, the amount is paid at the exchange rate on the day of repayment, and that this agreement is made on the day of repayment and not before. This also applies to the repayment of installments. Most importantly, nothing from the currency exchange that took place should remain outstanding on the debtor's part. Furthermore, transfer and deposit into an account are considered constructive possession.