Selling currencies on credit
Q:
1. I have a friend that buys euros from me. He usually buys from me because I give him facilities to pay. For example, I sell him 20 000 euros at 13 rand equal to R260 000 and he pays in 5 months cheques in rands.
2. This friend lives in a city 300km away and his neighbour also sells euros. Sometimes, when my friend wants euros, I sell them to him. Then I give him the rands to buy the euros on my behalf from his neighbour. My friend then pays me back for these euros later on. Is this allowed?
3. If I give him the rands to buy euros on my behalf, but he does not buy the euros and instead keeps the rands for other transactions, is it my responsibility?