When retrieving the billing details through the API, we are missing some information for a perfect understanding (and automation) :

• Number of nodes of the cluster. Indeed, without this information, the field "quantity" is kind of complicated to interpret
• Group Name. Each entry is attached to a groupId, but sometimes when the project has been deleted, it is impossible to retrieve its name, so pretty complicated to interpret (in the UI, the group name is available, so I guess it can be in the API)