- Combo products in Bill and Order contain a parent attribute instead of parents attribute.
- An external purchase object is added in the API.
- An external_purchase_amount can be specified in Bill, which will
make an arbitrary amount part of it.
- An external_purchases list can be specified when creating an Order,
which would make this list of external purchases part of
- The number of embedded products in a Event is limited to 500 products,
use the Products to get all of them.