I am using the Graphql api to try and set up my recurring billing for my app using the appSubscriptionCreate mutation.
I have the mutation all correct according to the docs, and the app is installed into a development store that is owned by me.
I actually get a response with an ID for the charge and no errors from the mutation post.
Even with the test: true flag enabled I just cant do a complete test cycle and am redirected to the following screen.
Upgrade your account
The operation could not be completed because of the following restrictions in your current plan:
Your plan does not allow Shopify App Store purchases. You can upgrade your plan to enable Shopify App Store purchases.
As account holder you can change the plan at any time.
This is likely careless messaging from Shopify API.
You should confirm you are not using a user token to create the subscription, instead use the shop token. I had this issue as well, switching to the shop token let me create it.
Only the shop owner has access to create billing subscriptions.