Add line items to existing orders

You can now add line items to existing orders, making it easy to append products or custom charges without creating a new order.

🚀 What’s New

• Order line item merging – set Line: Command to MERGE when updating orders to add new products or custom line items after the order is created.
• Archived order handling – the app automatically unarchives closed orders, adds the line items, and re-archives them if needed.
• Custom line items – add fees, services, or custom charges by specifying a title and price without linking to a product variant.