If your friend plans to travel to Australia with a group, he must apply for a visa through a travel agency and travel with the travel agency.
3. If your South African friends choose individual self-help travel, then South African citizens must apply for an Australian 600 visa (individual self-help travel, paper application) when traveling to Australia, and the written application materials need to be submitted to the corresponding embassy or consulate through the corresponding Australian visa application center.
4. So, your South African friend can't buy a plane ticket and fly there directly. He must apply for an Australian tourist visa. Airlines are only responsible for providing transportation services and cannot solve the visa problem.
5. You can apply for a visa yourself, or you can entrust a relevant intermediary to handle it.
In the name of God, amen!