Currencies of the Islamic era

If we still to this day deal with regular paper currencies or with silver and cooper currencies .... Wither we deal with the Kuwaiti Dinar, or Egyptian pound, or the Saudi riyal, or the Moroccan dirham, or the Syrian lira, and other Arabic currencies. Do you know my little Arabic friend how did the commercial transaction were conducted, like buying and selling at the time of our ancestors? The way it was before Islam or at …

…things about your prophet on it.)) Abdull malek decided to answer the challenge and sent a letter to Gestinyan, declaring in it, his refusal to give up the Islamic currency, so Gestinyan abandoned his attitude out of glorification and magnification for Muslims, he said in one occasion: ((I only wanted to irritate with what I wrote to him, but now I wont because that is not the way to transact with the people of Islam)).