API v3 requests with search_fields

API v3 requests with search_fields

Hi, 
I am a beginner and trying the API. I would like to get the current ticket info with search_fields applied. I tried the follow request in the Admin -> API section and Postman. I can get filtered data (1 ticket) from the build-in API portal. But, I get all data (5 tickets) from Postman, not filtered. Please advise if anywhere I should adjust. Thank you. 

Only 5 ticket in the system. Only one subject contains abc.

{
    "list_info": {
        "row_count": 20,
        "start_index": 1,
        "sort_field": "subject",
        "sort_order": "asc",
        "get_total_count": true,
        "search_fields": {
            "subject": "abc"
        }
    }
}

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