Receiving the rating of the the delivery of an order with feedback (Node.js)

In this use case, the user rates the delivery of a fulfilled order. The rating is usually between 1 to 5. The delivery service sometimes asks for a reason why the user has provided a particular rating.

Code snippets

BPP receives protocol rating

/*
Example Request JSON:
{
    "context": {
        "domain": "local_retail",
        "country": "IND",
        "city": "std:080",
        "action": "rating",
        "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": "2021-06-23T08:18:49.303Z"
    },
    "message": {
        "id": "fulfillment_1",
        "value": 5
    }
}
*/
    // Auth middleware authenticates the digital signature of the incoming request
    router.post('/local_retail/rating', auth, rating);

    function rating({ 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"));
            processRating(headers, body)
        } catch (error) {
            res.status(500).send(httpResponse("NACK", error));
        }
    };

BPP processes the rating

    function processRating(requestHeaders, ratingRequestBody) {
        // Execute business logic here
        let ratingResponse = {}
        generateResponse(requestHeaders, ratingResponse)
    }

BPP generates response

    async function generateResponse(requestHeaders, rawResponse){
/*
Example Request JSON :
{
    "context": {
        "domain": "local_retail",
        "country": "IND",
        "city": "std:080",
        "action": "on_rating",
        "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": "2021-06-29T10:52:01.620Z"
    },
    "message": {
        "feedback": {
            "id": "b9e92323-5ff7-4e1f-be43-24e87362b89f",
            "descriptor": "https://feedback.bpp.com/provider/pooja-stores/2839",
            "parent_id": "fulfillment_1"
        }
    }
}
*/
        let onRatingResponseBody = {

        }
        //call protocol on_rating
        await callOnRating(requestHeaders, onRatingResponseBody);
    }

BPP calls protocol on_rating

    async function callOnRating(requestHeaders, onRatingResponseBody) {
        // 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}/local_retail/on_rating`, method: "POST", headers, data: onRatingResponseBody });
    }