LINE Bot - ThaiPost - Flex Message

let item_json = [];
let { response } = tracks;
let { items } = response;
let key = Object.keys(tracks.response.items);

if (key.length > 0) {
    let bgcolor;
    items[key[0]].forEach(function(detail) {
        bgcolor = (detail.delivery_status == 'S') ? '#ABEBC6' : '#EEEEEE';
        const item_temp = {
            "type": "box",
            "layout": "horizontal",
            "contents": [
            {
                "type": "box",
                "layout": "vertical",
                "contents": [
                    {
                        "type": "box",
                        "layout": "horizontal",
                        "contents": [
                        {
                            "type": "text",
                            "text": detail.status_date
                        }
                        ]
                    },
                    {
                        "type": "box",
                        "layout": "horizontal",
                        "contents": [
                            {
                                "type": "spacer",
                                "size": "xxl"
                            },
                            {
                                "type": "text",
                                "text": detail.status_description,
                                "size": "sm"
                            }
                        ],
                        "spacing": "none",
                        "margin": "md"
                    },
                    {
                        "type": "box",
                        "layout": "horizontal",
                        "contents": [
                            {
                                "type": "spacer",
                                "size": "xxl"
                            },
                            {
                                "type": "text",
                                "text": detail.location,
                                "size": "sm"
                            },
                            {
                                "type": "text",
                                "text": detail.postcode,
                                "size": "sm"
                            }
                        ],
                        "spacing": "none",
                        "margin": "md"
                    }
                ]
            }
            ],
            "backgroundColor": bgcolor,
            "cornerRadius": "md",
            "paddingAll": "10px"
        };

        item_json.push(item_temp);

    });


    payload = {
        "type": "bubble",
        "size": "giga",
        "body": {
        "type": "box",
        "layout": "vertical",
        "contents": [
            {
            "type": "text",
            "text": key[0],
            "decoration": "none",
            "size": "xl",
            "weight": "bold"
            },
            {
            "type": "box",
            "layout": "vertical",
            "contents": item_json,
            "spacing": "sm",
            "margin": "md"
            }
        ]
        }
    }
    reply_track(req, payload);    
} else {
    reply_notfound(req);
}