How I tried to create a shipment order:

Send POST using Postman to 

1. https://inventory.zoho.com/api/v1/shipmentorders?package_ids=1606567000000074023&salesorder_id=1606567000000071128&organization_id=XXX&authtoken=YYY, where XXX is my organization ID and YYY is my authtoken.
   

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?