Uninstalling the online store from sales channels

[AlexanderWeb]

Hi all, I am using the Shopify Storefront API to build an headless ecommerce app. I had previously installed the online store but I don't think it's needed anymore as I am building my own. custom front end with the API.

When I try to uninstall it it doesn't allow me to do it saying that there was an error.

If I am only using the storefront API when the checkout url is generated from one of the GraphQL queries will it have "myshopify" in it? If that is the case do I still need to connect it to an existing domain so that I can get: "mycustomdomain.com/checkouts/cn/**********"? 

I am on the basic plan.