Within Usage Product Inventories, there can be one or more usage product references (e.g., telephone numbers).
Adding References:
When creating a Usage Product Inventory, specify references as a list in the initial request.
Adding Additional References:
Use the add operation on PATCH /usage-product-inventories endpoint to add more references after creation.
Updating Individual References:
Use the add or replace operation on the PATCH /usage-product-references endpoint to update specific references.
Read more about JSON Patch operations.