## 1. Introduction

# 1. Introduction

This section provides an overview of the current system architecture, business requirements, and operational constraints relevant to the Order Management and CSV Import functionality for the EC site order management system. The documentation is structured in accordance with ISO-29148 requirements and is strictly based on the provided knowledge base context.

## 1.1 Purpose

The purpose of this document is to define the requirements, limitations, and operational context for the order management system, focusing on the creation, processing, and import of orders, as well as associated payment and notification services. The document aims to ensure accurate and compliant implementation of business rules and technical constraints during system development and migration activities. All requirements herein have been validated by relevant stakeholders, including business, technical, and compliance teams.  
[KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0e0f1dd0-0f46-4d13-a092-e3cdc6fdd205], [KB-16181d30-2dd3-421e-bab0-939cd85255d2]

## 1.2 Scope

This document covers the following aspects of the EC site order management system:

- Order creation and management via REST API
- Payment processing for individual orders
- Notification service for order-related communications
- CSV import requirements and limitations for bulk order operations
- System constraints impacting batch processing, payment aggregation, and notification throughput
- Integration points between Order Service, Payment Service, and Notification Service

Excluded from scope are clinical, insurance, and patient management features not directly related to order processing.  
[KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0e0f1dd0-0f46-4d13-a092-e3cdc6fdd205], [KB-16181d30-2dd3-421e-bab0-939cd85255d2]

## 1.3 System Overview

The EC site order management system consists of a React single-page application (SPA) frontend interfacing with three backend microservices via REST APIs:

- **Order Service:** Handles creation, retrieval, update, and cancellation of orders. Only single-order creation is supported; batch or bulk order creation is not available.
- **Payment Service:** Processes payments for individual orders. There is no batch payment API; each order requires a separate payment transaction.
- **Notification Service:** Sends order-related notifications (e.g., confirmation emails). Notifications are sent individually per order; no bulk notification capability exists.

All inter-service communication is synchronous REST over HTTP, with defined timeouts and no asynchronous or event-driven messaging.  
[KB-050d0be4-11bc-4945-80e4-1f59d3187e45], [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0d7daadd-e958-4592-900a-55db91f8aa55]

## 1.4 Key Business Requirements

- Orders must be created one at a time, specifying customer information and order details.
- Payment processing is performed per order, with strict amount limits (minimum 100 JPY, maximum 1,000,000 JPY per transaction).
- Notification emails are sent individually for each order, subject to rate limits (10 notifications per second).
- There is significant demand from corporate customers for bulk order import via CSV files (100–10,000 orders), but this feature is not currently implemented.
- The system must support paginated order listings and provide order detail views aggregating data from all backend services.  
[KB-0e0f1dd0-0f46-4d13-a092-e3cdc6fdd205], [KB-16181d30-2dd3-421e-bab0-939cd85255d2], [KB-155b5f4a-d232-4166-bb158f86ceb1], [KB-1603dccf-0e13-426d-a4c3-527af9e69c16]

## 1.5 Major System Constraints

The following limitations define the boundaries of the current system:

| ID      | Limitation                                                                                                   | Impact Area          | Severity   |
|---------|--------------------------------------------------------------------------------------------------------------|----------------------|------------|
| LIM-001 | Order creation is single-entry only. No bulk or batch order creation capability exists.                      | Order Service        | High       |
| LIM-002 | No CSV/file-based order import functionality. No endpoint to upload and process order data from files.        | Order Service        | High       |
| LIM-003 | Payment processing handles one transaction at a time. No batch payment API exists.                           | Payment Service      | High       |
| LIM-004 | Notifications are sent individually per order. No bulk notification capability exists.                       | Notification Service | Medium     |
| LIM-005 | Cross-service calls are sequential. Order creation flow executes sequentially (Order → Payment → Notification).| All Services         | Medium     |
| LIM-006 | No progress tracking for batch operations. No mechanism to track progress of multi-item operations.          | All Services         | Medium     |

[KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a]

## 1.6 CSV Import Demand and Limitations

There is substantial business demand for bulk order import via CSV files, especially from corporate customers requiring operational efficiency for large order volumes (100–10,000 orders). However, the current system does not support CSV upload, batch processing, or file-based order import. All orders must be created individually via REST API or the management interface.  
[KB-155b5f4a-d232-4166-bb158f86ceb1], [KB-1603dccf-0e13-426d-a4c3-527af9e69c16], [KB-161f44bf-9450-491f-b894-1fd70c185060]

## 1.7 Integration and Processing Flow

Order creation, payment processing, and notification sending are executed sequentially for each order. There is no parallel or batch processing capability, resulting in significant latency for large order volumes. For example, processing 10,000 orders requires 10,000 API calls, and notification rate limits mean confirmation emails alone require at least 1,000 seconds (~17 minutes).  
[KB-150eb89c-77b0-415b-a547-3ed0502eec24], [KB-04a84995-0820-4319-9d26-c1582821058a], [KB-033639ab-c6f8-4f72-a373-bf76d05dd6cf]

## 1.8 Document Structure

This document is organized to comply with ISO-29148 requirements and includes:

- Introduction (this section)
- Functional and business requirements
- System constraints and limitations
- Data requirements and schema references
- Interface specifications
- Security and compliance requirements
- Approval and review information

## 1.9 Approval and Review

All requirements and constraints documented herein have been reviewed and approved by the Lead Architect, IT Operations Manager, and Chief Information Officer.  
[KB-1489f684-99bc-4d2c-a85f-14c1ec2b256b]

---

*End of Section 1. Introduction*

## 2. Functional Requirements

## 2. Functional Requirements

### 2.1 Order Creation

| ID     | Requirement                                                                                                   | Priority |
|--------|---------------------------------------------------------------------------------------------------------------|----------|
| FR-001 | The system must allow creation of a **single order** by specifying customer information (name, email) and order details (item name, quantity, unit price). | P1       |
| FR-002 | The system must automatically calculate the total order amount as the sum of (quantity × unit price) for all items. | P1       |
| FR-003 | The system must provide paginated retrieval of order lists, supporting parameters: skip (default 0), limit (default 20). | P1       |
| FR-004 | The system must support retrieval of a single order by order ID, including all order items. Returns 404 if not found. | P1       |
| FR-005 | The system must allow updating the status of an order. Setting status to SHIPPED must trigger a shipping notification. | P1       |
| FR-006 | The system must allow cancellation of an order, which triggers refund processing via Payment Service and sends a cancellation notification via Notification Service. | P1       |
| FR-007 | The system must accept payment status updates from Payment Service via webhook and update order status accordingly. | P1       |

**Source:** [KB-0e0f1dd0-0f46-4d13-a092-e3cdc6fdd205], [KB-0972bd0e-7d3-4b2c-a364-813e023a3495], [KB-186b33d7-f985-455b-8117-0cd019912510]

---

### 2.2 Payment Processing

| ID     | Requirement                                                                                                   | Priority |
|--------|---------------------------------------------------------------------------------------------------------------|----------|
| PAY-001| Payment processing must be performed **one transaction at a time**. No batch payment API exists; each order requires an individual payment API call. | High     |
| PAY-002| Payment Service must support POST /api/v1/payments for single payment processing. Minimum amount: 100 JPY, maximum: 1,000,000 JPY per transaction. | High     |
| PAY-003| Payment Service must support GET /api/v1/payments/order/{order_id} for payment lookup (e.g., for refunds). | High     |
| PAY-004| Payment Service must support POST /api/v1/payments/refund for refund processing on order cancellation. | High     |
| PAY-005| Payment Service API timeout is 30 seconds. No retry mechanism; failures revert order status to PENDING and are logged. | High     |

**Source:** [KB-01305cb3-d331-4b4b-ba02-69ada467b41d], [KB-05a9aed3-6a71-4c74-ac19-6bfec293268b], [KB-186b33d7-f985-455b-8117-0cd019912510], [KB-1718c2d8-b71b-4113-9906-a6d9765958ff], [KB-10744011-e9ca-48b5-ac6d-4f9f3627b7e6], [KB-11739ab0-b209-41e4-b73e-7d7f1d631106b]

---

### 2.3 Notification Processing

| ID     | Requirement                                                                                                   | Priority |
|--------|---------------------------------------------------------------------------------------------------------------|----------|
| NOTIF-001 | Notification Service must send notifications **individually per order**. No bulk notification capability; each notification requires a separate API call. | Medium   |
| NOTIF-002 | Notification Service must support POST /api/v1/notifications/email for sending a single email per request. | Medium   |
| NOTIF-003 | Notification Service API rate limit is 10 requests per second. | Medium   |
| NOTIF-004 | Notification Service API timeout is 10 seconds. No retry mechanism; failures are logged. | Medium   |

**Source:** [KB-01305cb3-d331-4b4b-ba02-69ada467b41d], [KB-05a9aed3-6a71-4c74-ac19-6bfec293268b], [KB-06c5403a-d177-4525-b247-1d7ae37a86b8], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a], [KB-1718c2d8-b71b-4113-9906-a6d9765958ff]

---

### 2.4 CSV/Bulk Import Functionality

[GAP: Missing data for 2. Functional Requirements]

**Note:** The current system does **not** support CSV or file-based bulk order import. No endpoint or mechanism exists for uploading and processing order data from files (CSV, Excel, etc.). All orders must be created individually via the REST API.

**Source:** [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c], [KB-16181d30-2dd3-421e-bab0-939cd85255d2], [KB-110bd1b1-0680-48fd-9bf9-6a5929dbbdec]

---

### 2.5 Progress Tracking and Error Handling

[GAP: Missing data for 2. Functional Requirements]

**Note:** The system does **not** provide progress tracking for batch operations, as batch functionality does not exist. There is no mechanism to track progress or handle partial failures in multi-item operations.

**Source:** [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a], [KB-0e28e3cb-6977-43b1-ba8e-1ed80f2de11e]

---

### 2.6 System Constraints

| Constraint ID | Description                                                                                                  | Impact Area        | Severity   |
|---------------|--------------------------------------------------------------------------------------------------------------|--------------------|------------|
| LIM-001       | Order creation is single-entry only. No bulk or batch order creation capability exists.                      | Order Service      | High       |
| LIM-002       | No CSV/file-based order import functionality. No endpoint or mechanism to upload and process order data from files. | Order Service      | High       |
| LIM-003       | Payment processing handles one transaction at a time. No batch payment API exists. Each order requires an individual payment API call. | Payment Service    | High       |
| LIM-004       | Notifications are sent individually per order. No bulk notification capability exists. Each notification requires a separate API call. | Notification Service | Medium     |
| LIM-005       | Cross-service calls are sequential. Order creation flow (Order → Payment → Notification) executes sequentially. No parallel processing. | All Services       | Medium     |
| LIM-006       | No progress tracking for batch operations. No mechanism to track progress of multi-item operations.           | All Services       | Medium     |

**Source:** [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a]

---

### 2.7 Data Model Requirements

| Field         | Data Type | Null Allowed | Constraint             | Notes                        |
|---------------|-----------|--------------|------------------------|------------------------------|
| id            | INTEGER   | No           | PRIMARY KEY            |                              |
| order_id      | INTEGER   | No           | UNIQUE (1:1 mapping)   | Batch grouping not possible  |
| amount        | FLOAT     | No           | Min 100 JPY, Max 1,000,000 JPY |                              |
| currency      | VARCHAR   | No           | Default “JPY”          |                              |
| status        | ENUM      | No           | PaymentStatus          |                              |
| payment_method| VARCHAR   | No           | “credit_card”          |                              |
| transaction_id| VARCHAR   | No           | UNIQUE (UUID)          |                              |

**Source:** [KB-11739ab0-b209-41e4-b73e-7d7e0f433b2]

---

### 2.8 Integration and API Contracts

| Service         | Endpoint                                   | Purpose                                 | Timeout | Retry | Error Handling                |
|-----------------|--------------------------------------------|-----------------------------------------|---------|-------|-------------------------------|
| Payment Service | POST /api/v1/payments                      | Process payment for single order        | 30s     | None  | Log error, revert status      |
| Payment Service | GET /api/v1/payments/order/{order_id}      | Lookup payment for refund               | 30s     | None  | Log error                     |
| Payment Service | POST /api/v1/payments/refund               | Refund on cancellation                  | 30s     | None  | Log error, revert status      |
| Notification Service | POST /api/v1/notifications/email      | Send single email notification          | 10s     | None  | Log error                     |

**Source:** [KB-033639ab-c6f8-4f72-a373-bf76d05dd6cf], [KB-05a9aed3-6a71-4c74-ac19-6bfec293268b], [KB-1718c2d8-b71b-4113-9906-a6d9765958ff]

---

**Summary:**  
The system supports single order creation, individual payment processing, and individual notification sending, all via REST API endpoints. Bulk or batch functionality (CSV import, batch payment, batch notification, progress tracking) is not supported. All cross-service operations are executed sequentially. Data model and API contracts enforce strict constraints on transaction uniqueness and amount limits.  
All requirements and constraints are strictly based on the provided context.  


## 3. Non-Functional Requirements

# 3. Non-Functional Requirements

This section defines the non-functional requirements for the system, including performance, security, reliability, scalability, and system limitations. All requirements are derived strictly from the provided context.

---

## 3.1 Performance Requirements

### 3.1.1 API and System Performance

| Metric                      | Target                    | Measurement              |
|-----------------------------|---------------------------|--------------------------|
| API response time (p50)     | < 200ms                   | Application metrics      |
| API response time (p95)     | < 500ms                   | Application metrics      |
| API response time (p99)     | < 1,000ms                 | Application metrics      |
| Page load time (initial)    | < 2 seconds               | Lighthouse measurement   |
| Page load time (subsequent) | < 1 second                | Client-side metrics      |
| System availability         | 99.9% (8.77 hrs/year max) | Uptime monitoring        |
| Concurrent users            | 500+ simultaneous         | Load testing             |
| Database query time (avg)   | < 100ms                   | RDS Performance Insights |
| API throughput              | > 1,000 requests/minute   | Load testing             |

**Reference:** [KB-0d9e59c7-0414-46c2-b302-2f4cbc1e9e88]

### 3.1.2 Batch and Bulk Operations

- **No bulk order import:** The system does not support CSV/file-based order import. All orders must be created individually via the REST API. [KB-146a6a29-932f-485d-96d6-6a92ee610336]
- **No batch payment processing:** Each payment is processed per order, with no aggregation or batch API. [KB-146a6a29-932f-485d-96d6-6a92ee610336]
- **No bulk notification:** Notification Service processes one notification per API call, with a rate limit of 10 notifications per second. Sending 10,000 notifications requires at least 1,000 seconds (~17 minutes). [KB-06c5403a-d177-4525-b247-1d7ae37a86b8]
- **Sequential processing:** Order creation, payment, and notification are executed sequentially, not in parallel. If a payment call takes 10 seconds, the entire order creation process takes at least that long. [KB-033639ab-c6f8-4f72-a373-bf76d05dd6cf]
- **No progress tracking for batch operations:** The system lacks mechanisms to track the progress of multi-item operations, as batch operations do not exist. [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a]

---

## 3.2 Security Requirements

### 3.2.1 Authentication and Authorization

| Feature                 | Implementation                             | Priority   |
|-------------------------|--------------------------------------------|------------|
| Authentication          | OAuth 2.0 Resource Server + Azure AD       | Critical   |
| Authorization           | Method-level @PreAuthorize with SpEL       | Critical   |
| CSRF Protection         | SameSite cookies + CSRF tokens             | High       |
| CORS Policy             | Whitelist-based origin validation          | High       |
| Content Security Policy | Strict CSP headers                         | High       |
| Rate Limiting           | Bucket4j with Redis backend                | Medium     |
| Input Validation        | Bean Validation + custom validators        | Critical   |
| Output Encoding         | OWASP Java Encoder                         | Critical   |
| Session Management      | Stateless (JWT) with Redis token blacklist | Critical   |
| Dependency Scanning     | OWASP Dependency-Check in CI/CD            | High       |

**Reference:** [KB-0910e88e-c115-4412-a137-d96b5c1a2082]

### 3.2.2 Token and Session Security

| Configuration             | Value / Requirement                           |
|---------------------------|-----------------------------------------------|
| JWT Algorithm             | RS256 (RSA Signature with SHA-256)            |
| JWT Issuer                | https://login.microsoftonline.com/{tenant-id} |
| JWT Audience              | api://dentalcare-pro                          |
| Access Token Lifetime     | 15 minutes                                    |
| Refresh Token Lifetime    | 8 hours (sliding window)                      |
| CORS Allowed Origins      | Whitelist only (per environment)              |
| CSRF                      | SameSite=Strict cookies + double-submit       |
| Content-Security-Policy   | default-src ‘self’; script-src ‘self’         |
| X-Content-Type-Options    | nosniff                                       |
| X-Frame-Options           | DENY                                          |
| Strict-Transport-Security | max-age=31536000; includeSubDomains           |

**Reference:** [KB-06cbdf57-f5b7-42c6-9d15-4119f65cd34e]

### 3.2.3 Error Handling and Information Disclosure

- **Critical Security Rule:** Error responses in production must never contain PHI, stack traces, SQL queries, internal file paths, server names, or framework version information. Violations are treated as security incidents. [KB-10300d8a-a98a-4726-9be3-3957c2fe7bf4], [KB-140ca7f3-3348-4419-b06b-89561882a35e]

### 3.2.4 Encryption

| Control                          | Implementation                        | HIPAA Reference    |
|----------------------------------|---------------------------------------|--------------------|
| Encryption at rest (database)    | AWS RDS encryption (AES-256)          | §164.312(a)(2)(iv) |
| Encryption at rest (files)       | S3 SSE-KMS (AES-256)                  | §164.312(a)(2)(iv) |
| Encryption at rest (field-level) | JPA AttributeConverter + AES-256-GCM  | §164.312(a)(2)(iv) |
| Encryption in transit            | TLS 1.3 (all communications)          | §164.312(e)(1)     |
| Key Management                   | AWS KMS (customer-managed CMKs)       | §164.312(a)(2)(iv) |
| Data masking (dev/test)          | Faker-based synthetic data pipeline   | §164.514(b)(2)     |

**Reference:** [KB-116f84fb-2eec-4493-9762-414a92624981]

### 3.2.5 Audit Logging and Retention

| Log Category            | Hot Storage (Searchable)   | Warm Storage (Archived)   | Cold Storage (Compliance)   | Total Retention   |
|-------------------------|----------------------------|---------------------------|-----------------------------|-------------------|
| Authentication events   | 90 days                    | 1 year                    | 6 years                     | 7 years           |
| PHI access events       | 90 days                    | 1 year                    | 6 years                     | 7 years           |
| PHI modification events | 90 days                    | 2 years                   | 6 years                     | 8 years           |
| Administrative events   | 90 days                    | 1 year                    | 6 years                     | 7 years           |
| Security events         | 180 days                   | 2 years                   | 6 years                     | 8 years           |

**Reference:** [KB-059dda76-1df0-4539-a60b-e504ba4e11ea]

---

## 3.3 Reliability and Availability

- **System availability:** 99.9% uptime target (maximum 8.77 hours downtime per year). [KB-0d9e59c7-0414-46c2-b302-2f4cbc1e9e88]
- **Incident response:** Documented and tested incident response plan, identified incident response team, incident reporting mechanism, post-incident review, and breach notification procedures are in place. [KB-052c37cd-e1b9-4e3f-8d87-e4cff20e9718]
- **No retry/circuit breaker on cross-service calls:** Failures are logged but not retried; no circuit breaker pattern implemented. [KB-01305cb3-d331-4b4b-ba02-69ada467b41d], [KB-150eb89c-77b0-415b-a547-3ed0502eec24]
- **No batch error handling:** If a single item in a batch fails, there is no mechanism to continue processing the remainder, as batch operations are not supported. [KB-04a84995-0820-4319-bd26-c1582821058a]

---

## 3.4 Scalability and System Limitations

| ID      | Limitation                                                                                                   | Impact Area          | Severity   |
|---------|--------------------------------------------------------------------------------------------------------------|----------------------|------------|
| LIM-001 | Order creation is single-entry only. No bulk or batch order creation capability exists.                      | Order Service        | High       |
| LIM-002 | No CSV/file-based order import functionality.                                                                | Order Service        | High       |
| LIM-003 | Payment processing handles one transaction at a time. No batch payment API exists.                           | Payment Service      | High       |
| LIM-004 | Notifications are sent individually per order. No bulk notification capability exists.                        | Notification Service | Medium     |
| LIM-005 | Cross-service calls are sequential. No parallel processing of payment and notification.                       | All Services         | Medium     |
| LIM-006 | No progress tracking for batch operations. No mechanism to track progress of multi-item operations.           | All Services         | Medium     |

**Reference:** [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a], [KB-0f930ddc-1f3a-4014-a015-49fe1808f8d8]

---

## 3.5 Compliance

- **HIPAA compliance:** All responses containing PHI must include `Cache-Control: no-store` and `Pragma: no-cache` headers to prevent client-side caching. [KB-16e42083-f456-49a3-959d-419cdb9fc31d]
- **De-identification:** For reporting, analytics, and development/testing, PHI must be de-identified using the Safe Harbor method by removing all 18 identifiers as per 45 CFR §164.514(b)(2). [KB-03f9d790-a1e6-46b9-8aeb-0fc45505be6d]
- **Audit trail:** Comprehensive audit controls and log retention policies are enforced to meet regulatory requirements. [KB-059dda76-1df0-4539-a60b-e504ba4e11ea], [KB-116f84fb-2eec-4493-9762-414a92624981]

---

## 3.6 Maintainability and Extensibility

- **Versioning:** URI-based versioning with major version in the path (e.g., /v1/patients). Only major versions included in the URL; minor and patch changes are backward-compatible. Minimum 6 months deprecation notice before version retirement; maximum 2 active versions at any time. [KB-10300d8a-a98a-4726-9be3-3957c2fe7bf4], [KB-140ca7f3-3348-4419-b06b-89561882a35e]

---

## 3.7 Usability

- **Accessibility:** Accessibility compliance (WCAG 2.1 AA) is required for the React UI. [KB-0a1640fc-d3df-49c6-8191-220e34d8af3f]

---

## 3.8 Summary of Key Non-Functional Gaps

- No support for bulk or batch operations in order creation, payment, or notification.
- All cross-service integrations are synchronous and sequential, limiting throughput for high-volume operations.
- No progress tracking or partial failure handling for batch operations.
- Strict security and compliance controls are enforced for all PHI and system data.

---

**References:**  
[KB-0d9e59c7-0414-46c2-b302-2f4cbc1e9e88]  
[KB-146a6a29-932f-485d-96d6-6a92ee610336]  
[KB-06c5403a-d177-4525-b247-1d7ae37a86b8]  
[KB-033639ab-c6f8-4f72-a373-bf76d05dd6cf]  
[KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a]  
[KB-0910e88e-c115-4412-a137-d96b5c1a2082]  
[KB-06cbdf57-f5b7-42c6-9d15-4119f65cd34e]  
[KB-10300d8a-a98a-4726-9be3-3957c2fe7bf4]  
[KB-140ca7f3-3348-4419-b06b-89561882a35e]  
[KB-116f84fb-2eec-4493-9762-414a92624981]  
[KB-059dda76-1df0-4539-a60b-e504ba4e11ea]  
[KB-052c37cd-e1b9-4e3f-8d87-e4cff20e9718]  
[KB-03f9d790-a1e6-46b9-8aeb-0fc45505be6d]  
[KB-16e42083-f456-49a3-959d-419cdb9fc31d]  
[KB-0a1640fc-d3df-49c6-8191-220e34d8af3f]

## 4. Architecture

# 4. Architecture

## 4.1 Architectural Overview

The current system architecture for order management and related services is based on a microservices model, with REST API-based synchronous communication between services. The main components include:

- **Order Service:** Handles order creation, retrieval, and management. Only supports single-entry order creation via REST API; no bulk or batch order creation is possible.
- **Payment Service:** Processes payments for individual orders. Each payment transaction is handled separately; no batch payment API exists.
- **Notification Service:** Sends notifications (e.g., order confirmations, cancellations) on a per-order basis. No bulk notification capability is available.
- **Frontend (React SPA):** Provides a web-based management interface for order entry and administration. The UI does not support CSV or file-based order import; all orders must be entered individually.

All inter-service communication is synchronous REST over HTTP, with defined timeouts (30 seconds for payment, 10 seconds for notification/webhook). There is no message broker, event bus, or asynchronous communication channel implemented in the system. All cross-service calls are executed sequentially, and there is no parallel or queue-based processing for order creation, payment, or notification flows. [KB-0d7daadd-e958-4592-900a-55db91f8aa55], [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a]

## 4.2 System Context Diagram (Textual)

- **Frontend (React SPA)**
  - Connects to Order Service, Payment Service, and Notification Service via REST API.
- **Order Service**
  - Receives order creation requests from the frontend.
  - Calls Payment Service for payment processing (one order at a time).
  - Calls Notification Service to send order-related notifications (one notification per call).
- **Payment Service**
  - Processes payment for a single order per API call.
- **Notification Service**
  - Sends a single notification per API call (rate limited to 10/sec).

## 4.3 Key Architectural Building Blocks

| Component           | Technology / Interface                  | Notes                                                      |
|---------------------|-----------------------------------------|------------------------------------------------------------|
| Frontend            | React SPA                               | No CSV/batch import UI; only single order entry            |
| Order Service       | REST API                                | No batch endpoints; only single order creation supported   |
| Payment Service     | REST API                                | No batch payment; 1:1 order-payment mapping                |
| Notification Service| REST API                                | No bulk notification; 1:1 order-notification mapping       |

[KB-0d7daadd-e958-4592-900a-55db91f8aa55], [KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-0a7d4d64-4d48-4214-94eb-2f3f278ec66a], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c], [KB-0f930ddc-1f3a-4014-a015-49fe1808f8d8], [KB-11739ab0-b209-41e4-b73e-7d7e0c4338b2]

## 4.4 Architectural Constraints

The architecture is subject to the following critical constraints:

| ID      | Limitation                                                                                                    | Impact Area          | Severity   |
|---------|---------------------------------------------------------------------------------------------------------------|----------------------|------------|
| LIM-001 | Order creation is single-entry only. No bulk or batch order creation capability exists.                       | Order Service        | High       |
| LIM-002 | No CSV/file-based order import functionality.                                                                 | Order Service        | High       |
| LIM-003 | Payment processing handles one transaction at a time. No batch payment API exists.                            | Payment Service      | High       |
| LIM-004 | Notifications are sent individually per order. No bulk notification capability exists.                        | Notification Service | Medium     |
| LIM-005 | Cross-service calls are sequential. No parallel processing of payment and notification.                       | All Services         | Medium     |
| LIM-006 | No progress tracking for batch operations. No mechanism to track progress of multi-item operations.           | All Services         | Medium     |

[KB-146a6a29-932f-485d-96d6-6a92ee610336], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c], [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f]

### Additional Technical Constraints

- **No batch or bulk import endpoints**: All orders must be created individually via REST API. There is no support for CSV upload, drag-and-drop, or batch creation forms in the UI or backend. [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c]
- **No batch payment processing**: Each payment is linked to a single order (1:1 mapping). There is no mechanism to aggregate payments across multiple orders. [KB-10744011-e9ca-48b5-ac6d-4f9f-3627b7e6], [KB-11739ab0-b209-41e4-b73e-7d7e0c4338b2]
- **No bulk notification API**: Each notification (e.g., order confirmation) is sent via a separate API call, subject to a rate limit of 10 notifications per second. [KB-06c5403a-d177-4525-b247-1d7ae37a86b8], [KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c]
- **Sequential processing**: The order creation flow (Order → Payment → Notification) is strictly sequential. For large volumes (e.g., 10,000 orders), this results in extremely slow processing, as each step is not parallelized. [KB-150eb89c-77b0-415b-a547-3ed0502eec24], [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f]
- **No batch error handling**: If an error occurs during batch-like operations (simulated by repeated single order entries), there is no mechanism to continue processing the remaining items or to track partial failures. [KB-04a84995-0820-4319-9d26-c1582821058a]
- **Schema limitations**: The orders table does not contain batch_id, csv_source, or bulk_import_group columns, making it impossible to track which orders belong to a batch import. [KB-0f930ddc-1f3a-4014-a015-49fe1808f8d8]

## 4.5 Data Model Constraints

- **Order Table**: Lacks batch tracking fields (e.g., batch_id, csv_source, bulk_import_group). Each order is uniquely identified and cannot be grouped for batch processing. [KB-0f930ddc-1f3a-4014-a015-49fe1808f8d8]
- **Payment Table**: Enforces a 1:1 unique constraint between order and payment (order_id is unique). Amount per transaction is limited to 100 JPY minimum and 1,000,000 JPY maximum. [KB-11739ab0-b209-41e4-b73e-7d7e0c4338b2]

## 4.6 Service Integration Contracts

| Service Call                        | Endpoint                                 | Notes                                         |
|-------------------------------------|------------------------------------------|-----------------------------------------------|
| Order → Payment                     | POST /api/v1/payments                    | One payment per order; 30s timeout            |
| Order → Notification                | POST /api/v1/notifications/email         | One notification per order; 10/sec rate limit |
| Order → Payment (refund)            | POST /api/v1/payments/refund             | On order cancellation                        |
| Payment → Order (status update)     | POST /api/v1/orders/{order_id}/webhook   | Payment status update                         |

[KB-1718c2d8-b71b-4113-9906-a6d9765958ff], [KB-0d3f16d9-bca7-4fde-a49e-b12798f2f65f], [KB-186b33d7-f985-455b-8117-0cd019912510]

## 4.7 Performance and Scalability Considerations

- **API rate limits and sequential execution** result in low throughput for high-volume operations. For example, processing 10,000 orders requires 10,000 API calls, and notification delivery alone would take at least 1,000 seconds (over 16 minutes) due to the 10/sec rate limit. [KB-06c5403a-d177-4525-b247-1d7ae37a86b8], [KB-150eb89c-77b0-415b-a547-3ed0502eec24]
- **No parallelization**: All cross-service calls are executed sequentially, further increasing latency for bulk operations. [KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f]

## 4.8 Architectural Risks and Gaps

- The lack of batch processing, bulk import, and parallel execution significantly limits operational efficiency and scalability, especially for enterprise customers requiring high-volume order entry.
- There is no mechanism for tracking progress or handling partial failures in simulated batch operations.
- Schema limitations prevent future extensibility for batch features without major database changes.

---

**References:**  
[KB-0d7daadd-e958-4592-900a-55db91f8aa55]  
[KB-146a6a29-932f-485d-96d6-6a92ee610336]  
[KB-0a36efdc-f63e-4c6b-8191-220e34d8af3f]  
[KB-05b70fbd-4026-4ac9-b1e2-e21dabe7da5c]  
[KB-0f930ddc-1f3a-4014-a015-49fe1808f8d8]  
[KB-11739ab0-b209-41e4-b73e-7d7e0c4338b2]  
[KB-10744011-e9ca-48b5-ac6d-4f9f-3627b7e6]  
[KB-06c5403a-d177-4525-b247-1d7ae37a86b8]  
[KB-04a84995-0820-4319-9d26-c1582821058a]  
[KB-1718c2d8-b71b-4113-9906-a6d9765958ff]  
[KB-186b33d7-f985-455b-8117-0cd019912510]  
[KB-150eb89c-77b0-415b-a547-3ed0502eec24]