Excuses and exceptions to the norm from foreign 'possible' customers is a huge red flag for me. I have been burned and have backed out of several fishy appearing deals. He may not have a credit card but he could open a Pay Pal account.
Wire and bank transfers are possible but they are very costly.
Another red flag, for me, is when, as the transaction proceeds the customers command of English seems to deteriorate. Sometimes it gets to the point you don't know what they mean. And that is the intent, confusion is a scam in the making.
BTW, I have had many-many successful and happy overseas transactions. I do not paint with a broad brush.
"Folks is funny critters."
Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire