Well, according to statements made by Iranian officials and many of those proxy group leaders, like Hamas leader Ismail Haniyeh, when they visit Iran, they usually carry suitcases full of cash. Qassem Soleimani, before he was killed by a U.S. military operation in Iraq, visited those countries. He visited Syria, mostly. They carried cash. There were regular cargo flights from Iran to those countries, and those flights also transported cash and gold.
On June 12th, 2024. See this statement in context.