RMerchantTreeGroupByCategoryResponse

{
    "code": 0,
    "msg": "string",
    "data": {
        "categoryInfoResponses": [
            {
                "categoryId": "string",
                "categoryName": "string",
                "merchantGroupByCategoryResponses": [
                    {
                        "merchantId": "string",
                        "merchantName": "string"
                    }
                ]
            }
        ]
    }
}