This is an ongoing topic where Andrew's income remains a mystery for the most part, but according to the BBC sometimes court cases involving other people mention him.
This particular court case talks about a payment made a few months after the Maitlis interview. And also mentions two payments made to Eugenie who said it was a birthday gift from a family friend - the money paying for a party for her mother. All £25,000 of it!!!
Prince Andrew took money from firm linked to ripped-off pensioners - BBC News https://share.google/PLLxwpQhm7lmZ4TQR