This removes the Blizzard Store functionality from the game as well lets the Help and Support Microbutton show in place of the Shop Microbutton as it did prior to 5.4.2.
Only tested with default UI, if you want the button removed in your custom UI put in a request with that UI author
Note1: If you decide to uninstall this addon and want the Store functionality back you will need to run this little script in game.
Code:
/run EnableAddOn("Blizzard_StoreUI")
/reload
Note2: If you are more interested in a functional replacement of just the Shop Microbutton that doesn't disable the whole thing
check out my other addon
Blizz Shop to LFoR (Blizz Store to Raid Browser).
Use one or the other not both at the same time