Confirming a mobility service that requires payment before confirmation and receiving a confirmed booking (Java)

In this use case, the user confirms a booking of a mobility service after making the payment and receives a confirmed booking

Confirm

Code snippets

Client calls the BAP server to trigger confirm:

    @PostMapping("/mobility/confirm_order")
    public ResponseEntity confirmOrder(
            @RequestHeader HttpHeaders headers,
            @RequestBody ClientConfirmOrderRequest request) {
        var response = bapApplicationService.confirmOrder(request, headers);
        return ResponseEntity.ok(response);
    }

BAP server generates the protocol request body


/*
Example Request JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "confirm",
        "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": "12341242345",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "order": {
            "items":[
                {
                    "id": "sedan_spot",
                    "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": {
                "tracking": true,
                "start": {
                    "location": {
                        "id": "user-location",
                        "descriptor": {
                            "name": "Current user location"
                        },
                        "gps": "12.9349377,77.6055586"
                    },
                    "instructions": {
                        "name": "pick up instructions",
                        "short_desc": "Ask doorman to ring 21A"
                    },
                    "time": {
                        "label": "ETA",
                        "duration": "P12M"
                    },
                    "contact": {
                        "phone": "+919999999999",
                        "email": "[email protected]"
                    }
                },
                "end": {
                    "location": {
                        "gps": "12.914028, 77.638698"
                    }
                }
            },
            "quote": {
                "price": {
                    "currency": "INR",
                    "value": "180"
                },
                "breakup": [
                    {
                        "title": "Sedan Spot Booking",
                        "price": {
                            "currency": "INR",
                            "value": "170"
                        }
                    },
                    {
                        "title": "Service Charge",
                        "price": {
                            "currency": "INR",
                            "value": "10"
                        }
                    }
                ]
            },
            "payment": {
                "uri": "https://api.bpp.com/pay?amt=$640&mode=upi&[email protected]",
                "tl_method": "http/get",
                "params": {
                    "amount": "180",
                    "mode": "upi",
                    "vpa": "[email protected]"
                },
                "type": "ON-ORDER",
                "status": "PAID"
            }
        }
    }
}
*/

    public ClientResponse confirmOrder(ClientConfirmOrderRequest request, HttpHeaders headers) {

        // Generate message id
        var messageId = UUID.randomUUID().toString();

        // Check if transaction id exists in the request.
        // Generate if not exists
        var txnId = StringUtils.hasText(request.getTransactionId())
                ? request.getTransactionId()
                : UUID.randomUUID().toString();

        // Construct the Context based on the request parameters
        var context = Context.builder().domain(request.getDomain())
                .action(Context.ActionEnum.confirm)
                .messageId(messageId)
                .transactionId(txnId)
                .transactionId(UUID.randomUUID().toString())
                .timestamp(new Date().toString())
                .build();

        // Construct the protocol specific object to be passed to the BPP
        // to confirm the order for the selected items with payment details
        var items = ClientAssembler.of(request.getItems());
        var billing = ClientAssembler.of(request.getBilling());
        var fulfilmentDetails = ClientAssembler.of(request.getFulfilment());
        var quotation = ClientAssembler.of(request.getQuote());
        var payment = ClientAssembler.of(request.getPayment());
        var confirmOrderRequest = ConfirmRequest.builder()
                .context(context)
                .message(Message.builder().order(Order.builder()
                        .billing(billing)
                        .items(items)
                        .quote(quotation)
                        .payment(payment)
                        .build()).build())
                .build();

        return invokeConfirm(confirmOrderRequest, headers);
    }
}

BAP server calls protocol confirm to the network

    public Response invokeConfirm(ConfirmRequest request, HttpHeaders headers) {

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

        // Call BPP Confirm api from the returned endpoint.
        // Construct request headers with the public key
        var responseEntity = apiClient.post(url[0] + Context.ActionEnum.confirm,
                constructRequestHeaders(),
                request,
                Response.class);

        // Validate the received response
        if (responseEntity.getBody() == null || responseEntity.getBody().getError() != null ||
                "NACK".equals(responseEntity.getBody().getMessage().getAck().getStatus())) {
            // Return custom error to the client
            return null;
        }
        return Response.of("ACK", null);
    }

BAP receives protocol on_confirm

/*
Example Response JSON:
{
    "context": {
        "domain": "nic2004:60221",
        "country": "IND",
        "city": "std:080",
        "action": "on_confirm",
        "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": "12341242345",
        "timestamp": "2021-03-23T10:00:40.065Z"
    },
    "message": {
        "order": {
            "id":"trip_1",
            "state":"Driver en route",
            "items":[
                {
                    "id": "sedan_spot",
                    "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": {
                "tracking": true,
                "start": {
                    "location": {
                        "id": "user-location",
                        "descriptor": {
                            "name": "Current user location"
                        },
                        "gps": "12.9349377,77.6055586"
                    },
                    "instructions": {
                        "name": "pick up instructions",
                        "short_desc": "Ask doorman to ring 21A"
                    },
                    "time": {
                        "label": "ETA",
                        "duration": "P12M"
                    },
                    "contact": {
                        "phone": "+919999999999",
                        "email": "[email protected]"
                    }
                },
                "end": {
                    "location": {
                        "gps": "12.914028, 77.638698"
                    }
                }
            },
            "quote": {
                "price": {
                    "currency": "INR",
                    "value": "180"
                },
                "breakup": [
                    {
                        "title": "Sedan Spot Booking",
                        "price": {
                            "currency": "INR",
                            "value": "170"
                        }
                    },
                    {
                        "title": "Service Charge",
                        "price": {
                            "currency": "INR",
                            "value": "10"
                        }
                    }
                ]
            },
            "payment": {
                "uri": "https://api.bpp.com/pay?amt=$180&mode=upi&[email protected]",
                "tl_method": "http/get",
                "params": {
                    "amount": "180",
                    "mode": "upi",
                    "vpa": "[email protected]"
                },
                "type": "ON-ORDER",
                "status": "PAID"
            }
        }
    }
}
*/
    @PostMapping("/bap/on_confirm")
    public ResponseEntity onConfirm(
            @RequestHeader HttpHeaders headers,
            @RequestBody OnConfirmRequest request) {
        var response = bapCallbackApplicationService.onConfirm(request, headers);
        return ResponseEntity.ok(response);
    }

    public Response onConfirm(OnConfirmRequest request, HttpHeaders headers) {
        // Validate the headers received
        var isHeadersValid = validateHeaders(headers);
        // Construct and return error if the received headers are invalid
        if (!isHeadersValid) return null;

        // Store the data received based on message id for the client to poll
        saveToDB(request);

        return Response.of("ACK", null);
    }

Client polls BAP to get the on_confirm results

    // Endpoint for the client to poll the confirmed order based on the message id
    @GetMapping("/mobility/on_confirm")
    public ResponseEntity onConfirm(
            @PathVariable(ClientRoutes.PARAM_MESSAGE_ID) String messageId,
            @RequestHeader HttpHeaders headers) {
        var data = bapApplicationService.get(messageId);
        return ResponseEntity.ok(data);
    }