Paul Dunscombe

That's great, Mark, thanks for getting back to me and pointing that out. Now that I'm aware of that, I've been able to make the required calls, filter it out to the correct business and move on. Would have been ideal if this had been more obvious in the documentation but really appreciate your speedy reply. Cheers, Paul.

In my test environment (pointing to an app connected to a test subscription of Accounting) I'm able to do what I want - create, list and edit invoices, for example. When I point to the live environment (after changing the client id etc to make sure that it is only that one app connected to the subscription) I get access tokens back and can refresh my tokens but as soon as I try to list invoices I get an unauthorised response: [{"$severity":"error","$dataCode":"AuthorizationFailure","$message":"No active subscription. (MSE)","$source":""}] The app has been authorised and connected to a live, active subscription and I can't see why I'd be getting that. Any thoughts or obvious gotchas?