Custom Fields Values not gettimg set by Create Task API

Hi,

I am trying to set custom fields on task from external platform.
Task is getting created successfully but the custom fields not getting set in Task.

I tried various ways to add custom fields values In Request JSON while sending request along with other paramete.

Task created successfully but custom fields not getting set.

URL: "https://projectsapi.zoho.in/restapi/portal/[portalName]/projects/[ProjectName]/tasks/";

Tryout 1:
var postData={

"name":taskName,

"flag":"internal",

"person_responsible":assignTo,

"priority":priority,

"custom_fields" :{

"UDF_CHAR3":recIntId

}

var headersArr= {

"authorization": "Bearer "+accessToken,

"content-type": "application/x-www-form-urlencoded",

"cache-control": "no-cache"

};

Tryout 2:
var postData={

"name":taskName,

"flag":"internal",

"person_responsible":assignTo,

"priority":priority,

"custom_fields" :{

"UDF_CHAR3":recIntId,

"UDF_CHAR1": taskName

}

Tryout 3:
var postData={

"name":taskName,

"flag":"internal",

"person_responsible":assignTo,

"priority":priority,

"custom_fields" :[

{
"UDF_CHAR3":recIntId

{

"UDF_CHAR1": taskName

}

]

}

Tryout 4:
var postData={

"name":taskName,

"flag":"internal",

"person_responsible":assignTo,

"priority":priority,

"custom_fields" :[{

"UDF_CHAR3":recIntId,

"UDF_CHAR1": taskName

}]

}

How should I set task custom fields (2 fields). Its urgent .. please suggest a way.

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