In order to quit Many Sales, please follow these steps:
Step 1: At the Admin page of your store, select Apps
Step 2: Search for ManySales, click Delete button
To fully remove any left-over codes, please check this article.
Shopify will still charge the current 30 days billing cycle, even you've already uninstalled the app.
If you pause your store, you won't be charged for the next billing cycle. Refer to this Shopify article about how to pause, or close your store.
In case you change your mind later on, or ready to re-publish your store (after uninstalling), you can always re-subscribe to ManySales at any time, all your data will be synced back as well.
Should you need further support, please feel free to contact us via live chat or email us at email@example.com