How to remove your Shopify account
Use the direct link to go to your account settings.
Click “Please cancel my account”.
Now, choose a reason, and select ‘close my shopify store’ to confirm.
Direct removal link: http://shopify.com/admin/settings/account
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Shopify using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Shopify. Click here to find out how.