Reschedule a consultation appointment and receiving the updated order with payment terms (Node.js)

In this use case, the user reschedules the appointment and receives terms of payment if applicable,

Code snippets

Client calls the BAP server to trigger Update:

    router.post("/healthcare_consultation/reschedule_appointment", rescheduleAppointment);

    async function rescheduleAppointment({ body }, res) {
        try {
            //  .. Validate the client request before below function
            await generateUpdateOrderRequest(body)
        } catch (error) {
            res.status(500).send(httpResponse("NACK", error));
        }
    };

BAP server generates the protocol request body

    // Code to generate the protocol request body i.e. function generateUpdateOrderRequest() specified above

    async function generateUpdateOrderRequest(clientRequestBody) {
/*
Example Request JSON :
{
    "context": {
        "domain": "nic2004:85121",
        "country": "IND",
        "city": "std:080",
        "action": "update",
        "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": {
        "update_target": "items",
        "order": {
            "id": "order_1",
            "state": "Active",
            "items": [
                {
                    "id": "dr_veena_slot_2",
                    "quantity": {
                        "count": 1
                    }
                }
            ],
            "billing": {
                "name": "Jane Doe",
                "address": {
                    "door": "21A",
                    "name": "ABC Apartments",
                    "locality": "HSR Layout",
                    "city": "Bengaluru",
                    "state": "Karnataka",
                    "country": "India",
                    "area_code": "560102"
                },
                "email": "[email protected]",
                "phone": "+919876523210"
            },
            "fulfillment": {
                "type": "IN-PERSON",
                "end": {
                    "location": {
                        "id": "good-health-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]"
                    }
                },
                "agent": {
                    "name": "Dr. Veena H",
                    "dob": "1989-08-12",
                    "gender": "Female",
                    "tags": {
                        "doctor_registration_no": "12345"
                    },
                    "phone": "+919876543210",
                    "email": "[email protected]"
                },
                "customer": {
                    "person": {
                        "name": "Remya C",
                        "dob": "1989-08-12",
                        "gender": "Female"
                    },
                    "contact": {
                        "phone": "+919898987676",
                        "email": "[email protected]"
                    }
                }
            },
            "quote": {
                "price": {
                    "currency": "INR",
                    "value": "1100"
                },
                "breakup": [
                    {
                        "title": "Consultation 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&vpa=bpp@upi",
                "tl_method": "http/get",
                "params": {
                    "transaction_id": "ksh87yriuro34iyr3p4",
                    "amount": "1100",
                    "mode": "upi",
                    "vpa": "bpp@upi"
                },
                "type": "ON-FULFILLMENT",
                "status": "NOT-PAID"
            }
        }
    }
}
*/
        //The below code generates the above example JSON.
        const transactionId = _.get(clientRequestBody, "transactionId");
        // Returns the Context including MessageId
        const updateRequestBody = {
            context,
            message: {
                // Construct from the request
            };
        };
        //call protocol update order
        const response = await callUpdate(updateRequestBody);
        res
        .status(200)
        .send({ ...response.data, messageId: context["message_id"] });
    }

BAP server calls protocol update to the network

    async function callUpdate(updateRequestBody) {
        // It lookups the registry for BG OR BPP
        let uri = lookup();
        // Construct Header
        const headers = constructAuthHeader(); // Auth Header with digital Signature
        return axios({ url: `${uri}/healthcare_consultation/updare`, method: "POST", headers, data: updateRequestBody });
    }

BAP receives protocol on_update

/*
Example Response JSON:
{
    "context": {
        "domain": "nic2004:85121",
        "country": "IND",
        "city": "std:080",
        "action": "on_update",
        "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": "Active",
            "items": [
                {
                    "id": "dr_veena_slot_2",
                    "quantity": {
                        "count": 1
                    }
                }
            ],
            "billing": {
                "name": "Jane Doe",
                "address": {
                    "door": "21A",
                    "name": "ABC Apartments",
                    "locality": "HSR Layout",
                    "city": "Bengaluru",
                    "state": "Karnataka",
                    "country": "India",
                    "area_code": "560102"
                },
                "email": "[email protected]",
                "phone": "+919876523210"
            },
            "fulfillment": {
                "type": "IN-PERSON",
                "end": {
                    "location": {
                        "id": "good-health-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]"
                    }
                },
                "agent": {
                    "name": "Dr. Veena H",
                    "dob": "1989-08-12",
                    "gender": "Female",
                    "tags": {
                        "doctor_registration_no": "12345"
                    },
                    "phone": "+919876543210",
                    "email": "[email protected]"
                },
                "customer": {
                    "person": {
                        "name": "Remya C",
                        "dob": "1989-08-12",
                        "gender": "Female"
                    },
                    "contact": {
                        "phone": "+919898987676",
                        "email": "[email protected]"
                    }
                }
            },
            "quote": {
                "price": {
                    "currency": "INR",
                    "value": "1200"
                },
                "breakup": [
                    {
                        "title": "Consultation Charges",
                        "price": {
                            "currency": "INR",
                            "value": "1000"
                        }
                    },
                    {
                        "title": "Service Charge",
                        "price": {
                            "currency": "INR",
                            "value": "100"
                        }
                    },
                    {
                        "title": "Reschedule charge",
                        "price": {
                            "currency": "INR",
                            "value": "100"
                        }
                    }
                ],
                "ttl": "P1H"
            },
            "payment": {
                "uri": "https://api.bpp.com/pay?amt=$amount&txn_id=ksh87yriuro34iyr3p4&mode=upi&vpa=bpp@upi",
                "tl_method": "http/get",
                "params": {
                    "transaction_id": "ksh87yriuro34iyr3p4",
                    "amount": "1200",
                    "mode": "upi",
                    "vpa": "bpp@upi"
                },
                "type": "ON-FULFILLMENT",
                "status": "NOT-PAID"
            }
        }
    }
}
*/
    // Auth middleware authenticates the digital signature of the incoming request
    router.post("/healthcare_consultation/on_update", auth, onTrack);
    async function onTrack({ body }, res) {
        // Save the response to Database
        await saveToDb(body);
    };

Client polls BAP to get the on_update results

    // Endpoint for the client to poll the search data based on the message id
    async function getMessageById(req) {
        try {
            const messageId = _.get(req, "messageId");
            // Get the data using message Id
            const response = await getData(messageId);
            res.status(200).send(httpResponse('ACK', "", response));
        } catch(error) {
            res.status(500).send(httpResponse("NACK", error));
        }
    };