Unable to create shipment order using Zoho Inventory API

Unable to create shipment order using Zoho Inventory API

Hello,

How can I get shipment_number using Zoho Inventory API so I can use it for shipment order creation ( https://www.zoho.com/inventory/api/v1/#Shipment_Orders_Create_a_Shipment_Order)?

How I tried to create a shipment order:
Send POST using Postman to 
In Body raw I added:
  1. JSONString='{
  2.     "shipment_number": "SHP-00010",
  3.     "date": "2018-11-02",
  4.     "delivery_method": "manual",
  5.     "tracking_number": "4815000000044822"
  6. }'
In response I get:
  1. {
  2.     "code": 4,
  3.     "message": "Invalid value passed for JSONString"
  4. }

I used the same approach for creating a Package and it worked.
Can somebody please tell me what is the right way - how to create a Shipment Order using Zoho Inventory API?