Tips for Haggling
You basically click on the haggle button everytime it’s hovering one of the brown sections of the bar. It will tip the scales in your favour and move that section along the bar.
Keep doing that until the scales are completely tipped towards the customer and they will pay more.
You can stop at any time as well by haggling on the green sections on the sides of the bar if I’m not mistaken.
It also lowers the haggle points each time the scale goes back and forth, so you want to not miss any triggers (like doing them 1 by 1, you want all in sequence).