How to add Vendor_Name in Purchase_Order module insert REST API

How to add Vendor_Name in Purchase_Order module insert REST API

Can you provide a sample input Json for purchase_order module insert REST API ? 

I am posting below JSON

{"data":[{"id":"233855000000834001","Subject":"testpu","Vendor_Name":"kkvendor","Billing_City":"surat bharat","Purchase_Items":[{"Total":5915724.0,"Quantity":33.0,"Description":"na tum jano na ham","Product_Name":{"id":"233855000000803004"},"id":"233855000000834005"}]}]}

and getting below error

{"data":[{"code":"INVALID_DATA","details":{"expected_data_type":"bigint","api_name":"Vendor_Name","json_path":"$.data[0].Vendor_Name"},"message":"invalid data","status":"error"}]}

Please help regarding the issue.