I'm trying to update 5000 project names via API in Zoho People using Postman. When I try using JSON I get at HTTP Status 400 - Bad Request error. I suspect I'm not correctly authenticating.

Post: https://people.zoho.com/people/api/forms/json/P_TimesheetJobsList/updateRecord?recordId=XXXXXXXXXXXXXXXXX&inputData={"Project_Name":"Website Designing"}

Authentication Tab under Headers:

Authentication Tab:

Results

In the developer console I'm using Server Based Application:

Using the below parameters:

Which generate the client ID and client secret: