Prepare the transfer of money carefully, think about the little things. Please note that if you returned the debt, but not taken for some reason IOU, you become a slave of this paper, and the consequences can be very sad. If you do not require a receipt, so I fully trust your partner and are fully confident in his honesty.
Arrange a meeting with the lender in advance. Tell him the place and time and also don't forget to remind you to bring your receipt that you took money in debt. Invite one or two people as witnesses. They will be useful not only in the event of litigation in future (in case it goes badly), but for the protection of money, if we are talking about very large sums.
At the agreed time give the whole amount to the lender. The presence of these witnesses will be useful if someone in the future wants to challenge the fact of transfer of money or accuse you that you gave is not the full amount. Count the money in front of witnesses.
If you pass only part of the agreed amount, ask your partner a receipt in which he will indicate received from you the amount of money. Do not forget – the contract must be spelled out as your passport details and the lender, and should bear both signatures.
Demand from your lender, that he personally wrote ious, that doesn't matter to you any claims.
Be very careful if your opponent did not bring along your receipt and if you did not have at hand a reliable witness. Demand from the creditor a counter-receipt, which he will have to explain why did not bring the original contract and that the amount paid by you in full. Only when such a document will prove you have on hand, feel free to give your debt – now you have insurance in the case of dishonesty.