I have been asked many times, and so I put here some of the features we need: place limit order, close limit order, get active orders...etc.
The custom driver must be usable with respect to the HaasOnline Trading Server documentation:
https://help.haasonline.com/api/examples/scripted-driverX, do you have any programming skills? You will need to verify code written by a newbie before you put it into production (I hope).