Zoho Inventory API: Sales Orders, Packages, Shipment Orders and Items

Currently, I am using another warehouse management system, but I would like to integrate ZOHO inventory system via API to:

Retrieve Confirmed Sales Orders or Packages from ZOHO to my WMS;
My WMS will then process the Sales Order or Packages to create Shipment Orders on ZOHO;
From time to time, my WMS will update Shipment Orders status to Delivered;
From time to time, my WMS will synchronize the stock balance from WMS to ZOHO by updating Item;

However, after reviewing the API document ( https://www.zoho.com/inventory/api/v1/), I encounter some problems:

My estimate amount of order every might exceed 1000, and since the API call limit is 100 per minute and max 2500 per day, is there any way to bulk create and update Shipment Orders via API?
Hence, is there any way to bulk update Items?
According to List all packages in the API help docs(https://www.zoho.com/inventory/api/v1/#Packages_List_all_packages), the Response Example provided includes "line_items", however when I try to do the same, the response result does not include any "line_items", which I expected to use "line_items" to create record in my WMS. Is this a bug or misleading information?
Hence, is there any way to List All Sales Orders with line_items?
Hence, is there any way to List All Packages with line_items?

Thank you.

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