Cancellation of a diagnostic service appointment with reason for cancellation (Node.js)
In this use case, the user or the diagnostic center cancels the appointment with or without reason
Code snippets
BPP receives protocol cancel
/*
Example Request JSON:
{
"context": {
"domain": "nic2004:85195",
"country": "IND",
"city": "std:080",
"action": "cancel",
"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": "2021-03-23T10:00:40.065Z"
},
"message": {
"order_id": "order_1",
"cancellation_reason_id": "reason_3"
}
}
*/
// Auth middleware authenticates the digital signature of the incoming request
router.post('/healthcare_diagnostics/cancel', auth, cancel);
function cancel({ 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"));
processCancel(headers, body)
} catch (error) {
res.status(500).send(httpResponse("NACK", error));
}
};
BPP processes the cancel
function processCancel(requestHeaders, cancelRequestBody) {
// Execute business logic here
let cancelResponse = {}
generateResponse(requestHeaders, cancelResponse)
}
BPP generates response
async function generateResponse(requestHeaders, rawResponse){
/*
Example Request JSON :
{
"context": {
"domain": "nic2004:85195",
"country": "IND",
"city": "std:080",
"action": "on_status",
"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": "2021-03-23T10:00:40.065Z"
},
"message": {
"order": {
"id": "order_1",
"state": "Cancelled",
"items": [
{
"id": "health_checkup",
"quantity": {
"count": 1
}
}
],
"billing": {
"name": "John Doe",
"address": {
"door": "21A",
"name": "ABC Apartments",
"locality": "HSR Layout",
"city": "Bengaluru",
"state": "Karnataka",
"country": "India",
"area_code": "560102"
},
"email": "[email protected]",
"phone": "+919876543210"
},
"fulfillment": {
"end": {
"location": {
"id": "srs-koramangala",
"gps": "12.9349377,77.6055586"
},
"time": {
"range": {
"start": "2021-08-11T04:30:00.000Z",
"end": "2021-08-11T05:30:00.000Z"
}
},
"contact": {
"phone": "+919876543210",
"email": "[email protected]"
}
}
},
"quote": {
"price": {
"currency": "INR",
"value": "1100"
},
"breakup": [
{
"title": "Lab Charges",
"price": {
"currency": "INR",
"value": "1000"
}
},
{
"title": "Service Charge",
"price": {
"currency": "INR",
"value": "100"
}
}
],
"ttl": "P1H"
},
"payment": {
"uri": "https://api.bpp.com/pay?amt=$amount&txn_id=ksh87yriuro34iyr3p4&mode=upi&[email protected]",
"tl_method": "http/get",
"params": {
"transaction_id": "ksh87yriuro34iyr3p4",
"amount": "1100",
"mode": "upi",
"vpa": "[email protected]"
},
"type": "ON-FULFILLMENT",
"status": "NOT-PAID"
}
}
}
}
*/
// The below code generates the above example JSON.
let onCancelResponseBody = {}
// call protocol on_cancel
await callOnCancel(headers, onCancelResponseBody);
}
BPP calls protocol on_cancel
async function callOnCancel(requestHeaders, onCancelResponseBody) {
// Take the subscriber Id from the header and calls the registry to get the url. If already cached it need not to call again
const uri = await lookup(requestHeaders);
// Construct Header
const headers = constructAuthHeader(); // Auth Header with digital Signature
return axios({ url: `${uri}/healthcare_diagnostics/on_cancel`, method: "POST", headers, data: onCancelResponseBody });
}