In our app we need the IOSS/OSS for a shop so we can get it added to the packages.
How can we get this number? The response from GET /admin/api/<version>/shop.json doesn't have it.
Will it be attached to each order so we can get it from the order body?
So currently those are internal only and wouldn't be exposed to be read via API.
At this time we do not have a roadmap as to when we will make these public (or present on the Order) though I will most certainly will make this request known to our Product team - they consider Partner Feedback when changes are made to our API.