How do I delete one store's synced data?

Open Settings, then the Store tab, and click Delete store data at the bottom. Only the account's owner can do this. A box asks you to type the store's name exactly, to be sure. Then click Delete everything.

This stops the sync and ends nouz's access to the store. nouz then deletes the store's synced orders, refunds and payments for good, in the background. The daily figures built from them, and your exports of them, go too. There is no undo.

Some things stay, on purpose. Your products with their cost rules stay, because you entered the costs yourself. Your ad spend stays too, because it is not Shopify data. So if you connect the store again later, a fresh sync brings the orders back. They are priced with your own cost rules again.

If you only want the sync to stop, delete nothing: disconnect Shopify instead, and everything stays. To delete the whole account, write to support@nouz.co from the address you sign in with. That removes everything, cost rules included. Before either, you can take a copy with the full account export.