What happens once a subscription expires or is cancelled?

Is there functionality built in to prevent account users continuing to use the application, or do we need to build this?

I am extending the global trial functionality which would require the same behaviour, so wondering if I need to intercept requests and check if the subscription has expired and send them both to the same error page.

Not sure, but can you set yourself up with a really short subscription period and just test it that way?

I added my own code to check if the current_account is in a trial or has a paid subscription.

If they don't I display a paywall with subscription link.

<% if current_account&.subscription.active? || current_account&.subscription.on_trial? || (current_account.trial_ends_at && current_account.trial_ends_at > Time.current) %>
    <%= yield %>
<% else %>
    <%= render "dashboard/expired_subscription" %>
<% end %>

I have generic a trial and a credit card trial so that's why there are 2 references to trials above. 

Not sure if this is exactly what you were asking.