Selecting a mobility option and sending the updated quote for the same (Java)

In this use case, the user selects a mobility option and receives the fare for the same

Code snippets

BPP receives protocol select

/*
Example Request JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "select",
        "core_version": "0.9.1",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "bpp_id": "https://mock_bpp.com/",
        "bpp_uri": "https://mock_bpp.com/beckn/",
        "transaction_id": "1209849124",
        "message_id": "12341242343",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "order": {
            "items":[
                {
                    "id": "sedan_spot",
                    "quantity": {
                        "count": 1
                    }
                }
            ]
        }
    }
}
*/
    // BPP Select endpoint
    @PostMapping("/bpp/select")
    public ResponseEntity select(
            @RequestHeader HttpHeaders headers,
            @RequestBody SelectRequest request) {
        var response = bppApplicationService.select(request, headers);
        return ResponseEntity.ok(response);
    }

BPP processes the select

    public Response select(SelectRequest request, HttpHeaders headers) {
        var selectResponse = new OnSelectRequest();
        // Validate the headers
        var isHeadersValid = validateHeaders(headers);
        // Construct and return error
        if (!isHeadersValid) return null;

        // Fetch the data based on the request
        var requestIntent = request.getMessage().getOrder();

        // Execute business logic here

        // Generate the response
        selectResponse = generateSelectResponse(selectResult);

        //invoke on_select api
        return invokeOnSelect(selectResponse, headers);
    }
}

BPP generates response

/*
Example Response JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "on_select",
        "core_version": "0.9.1",
        "bap_id": "https://mock_bap.com/",
        "bap_uri": "https://mock_bap.com/beckn/",
        "bpp_id": "https://mock_bpp.com/",
        "bpp_uri": "https://mock_bpp.com/beckn/",
        "transaction_id": "1209849124",
        "message_id": "12341242343",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "order": {
            "provider": {
                "id": "yellow-cabs",
                "locations": [
                    {
                        "id": "closest-sedan-spot",
                        "gps": "12.9349377,77.6055586"
                    }
                ]
            },
            "items": [
                {
                    "id": "sedan_spot",
                    "price" : {
                        "currency": "INR",
                        "value": "170"
                    },
                    "time": {
                        "label": "ETA",
                        "duration": "P13M"
                    },
                    "location_id": "closest-sedan-spot",
                    "quantity": {
                        "selected": {
                            "count": 1
                        },
                        "available": {
                            "count": 4
                        }
                    }
                }
            ],
            "quote": {
                "price": {
                    "currency": "INR",
                    "value": "180"
                },
                "breakup": [
                    {
                        "title": "Sedan Spot Booking",
                        "price": {
                            "currency": "INR",
                            "value": "170"
                        }
                    },
                    {
                        "title": "Service Charge",
                        "price": {
                            "currency": "INR",
                            "value": "10"
                        }
                    }
                ]
            }
        }
    }
}
*/
    public OnSelectRequest generateSelectResponse(List selectedResults) {
        var selectResult = SelectResponseBuilder.builder.result(selectedResults).build();
        // Convert response into protocol object similar to example above
        return selectResult;
    }

BPP calls protocol on_select

    public Response invokeOnSelect(OnSelectRequest selectResponse, HttpHeaders headers) {
        if(selectResponse.getError() == null) {
            // Call BAP on_select api with the select response

            // Call to look up function which returns the the public key and BAP/BG Endpoint to be called 
            var url = lookUp(headers);

            var response = apiClient.post(url[0] + Context.ActionEnum.on_select,
                    constructResponseHeaders(),
                    selectResponse,
                    OnSelectRequest.class);
            return Response.of("ACK", null);
        } else {
            return Response.of("NACK", null);
        }
    }