Use this endpoint to efficiently update several line items at once, such as adjusting quantities across multiple products
or updating billing dates for a group of items.

Important restrictions:

• All line items must belong to the specified order
• Each line item must be in an editable status (e.g., Draft or Pending)
• For external orders, only certain fields can be modified
• Line items in 'Activated' status can only have their ready-for-billing date updated