transaction search API - Permission denied

[Manojbhosale07]

I need urgent help in resolving this issue, any help would be much appreciated. 

I am trying to access the API through Postman. To do a feasibility for the Transaction search API. I want to get the OK(200) response for the List transaction entity. But when I hit this API passing a valid "access_token" I am getting this error :

{

    "localizedMessage": "No permission for the requested operation. ",

    "suppressed": [],

    "name": "PERMISSION_DENIED",

    "message": "No permission for the requested operation. ",

    "details": [

        {

            "field": null,

            "value": null,

            "location": null,

            "issue": "No permission for the requested operation. ",

            "description": null

        }

    ],

    "information_link": "https://developer.paypal.com/docs/classic/products/permissions/",

    "debug_id": "34729bf72823d"

Please could someone help me resolve this?