it works on servers with a loaded auction. to begin with, you sell the desired item, for example / ah sell 2000, and then activate the script. every 10 seconds it will resell the item (you can configure it), thereby putting it on the auc again. there may be difficulties with moving the mouse, so if the script does not work, change the size of the window with minecraft or change the mouse coordinates in the script itself.
Download the program (Download) and go to the macro editor
press the button «Open file»
and select the downloaded file
assign a macro to a key and run the program