If you are going to use commercial mayonnaise, skip these 3 steps, but I don't use much of that - I saw an interesting and quick method of olive oil mayonnaise. It is prepared in 2-3 minutes, I didn't like the taste very much, because it has a slightly bitter taste from olive oil, but in the dough it is very good.
So measure 100ml of natural soy milk, then pour 200ml of olive oil over it, put a pinch of salt.