Sending tracking information of a delivery order (Node.js)

In this use case, the user requests for a live delivery tracking link that can be rendered on the application.

Code snippets

BPP receives protocol track

/*
Example Request JSON:
{
    "context": {
        "domain": "delivery",
        "country": "IND",
        "city": "std:080",
        "action": "track",
        "core_version": "0.9.2",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "transaction_id": "1239890342",
        "message_id": "123793824",
        "timestamp": "2021-06-23T08:29:27.933Z"
    },
    "message": {
        "order_id": "order_1"
    }
}
*/
    // Auth middleware authenticates the digital signature of the incoming request
    router.post('/delivery/status', auth, track);

    function track({ headers, body }, res) {
        try {
            const message = _.get(body, "message");
            const context = _.get(body, "context");
            if (!context) {
                return res.status(400).send(httpResponse("NACK", "Missing Context"));
            }
            if (!message) {
                return res.status(400).send(httpResponse("NACK", "Missing Message"));
            }
            // ... Returns the ack immediately and continue the processing after validation
            res.status(200).send(httpResponse("ACK"));
            processStatus(headers, body)
        } catch (error) {
            res.status(500).send(httpResponse("NACK", error));
        }
    };

BPP processes the track

    function processStatus(requestHeaders, trackRequestBody) {
        // Execute business logic here
        let statusResponse = {}
        generateResponse(requestHeaders, statusResponse)
    }

BPP generates response

    function generateResponse(requestHeaders, rawResponse){

/*
Example Request JSON :
{
    "context": {
        "domain": "delivery",
        "country": "IND",
        "city": "std:080",
        "action": "on_track",
        "core_version": "0.9.2",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "transaction_id": "1239890342",
        "message_id": "123793824",
        "timestamp": "2021-06-23T08:31:04.045Z"
    },
    "message": {
        "tracking": {
            "url": "https://track.bpp.com?order_id=order_1",
            "status": "active"
        }
    }
}
*/
        //The below code generates the above example JSON.
        let onTrackResponseBody = {

        }
        //call protocol on_track
        await callOnTrack(requestHeaders, onTrackResponseBody);
    }

BPP calls protocol on_track

    function callOnTrack(requestHeaders, onTrackResponseBody) {
        // Take the subscriber Id from the header and calls the registry to get the url. If already cached it need not to call again
        const uri = await lookup(requestHeaders);
        // Construct Header
        const headers = constructAuthHeader(); // Auth Header with digital Signature
        return axios({ url: `${uri}/delivery/on_track`, method: "POST", headers, data: onTrackResponseBody })
    }