Cryptocurrencies? Aka the least private form of transactions, where not only the sender and receiver know, but the whole block chain immutably stores for everyone else to view?
There are cryptocurrencies like ZCash, Monero, Zano, Freedom Dollar, etc. that are sufficiently private.
There's also an option to just mail them cash, but some countries may seize all mailed cash if discovered.
this isn't reddit. if you are trying to act like a know it all at least do basic research.
crypto rubes are hilarious.