I'm building a embed APP for a carrier, on the setting, the shop can set up package size so we can choose it when printing a label, but how can we get it through graphql API?
I found there is a object "BoxDimensions", is it something we can use, I can't find any resource which contain this object.
Resources such as this one are documented for when someone needs to pass it to us in each case that I've seen, though admittedly I'm not sure of the context in which someone would use BoxDimensions off-hand. Unfortunately though, it isn't something that can be queried directly.
I'm not sure what your final plan is for your application, but it may be worthwhile to consider having your users provide their own package dimensions to you instead.