Catalog API returning 'Insufficient permissions to fulfill the request' error

I am getting ErrorCode 75015 as below with the catalog search endpoint: commerce/catalog/v1_beta/product_summary/search 
{
  "errors":[
     {
       "errorId":75015,
        "domain":"API_CATALOG",
        "category":"REQUEST",
        "message":"Insufficient permissions to fulfill the request."
      }
    ]
}

There might be several reasons for API failure. However; one of the main reasons is that the user account is not setting properly. 

The catalog API is available to eBay sellers that are : site verified (basic seller level), UserID verified or for merchant. Please going through the seller registration process via the following URL to set up a seller account on Production: https://www.ebay.com/help/selling/getting-paid/registering-seller?id=5226

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