> For the complete documentation index, see [llms.txt](https://host2host.onibonje.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://host2host.onibonje.com/docs/42-architecture-sign-off.md).

# Architecture Sign-Off

## 1. Purpose

This document confirms **complete architecture coverage** before implementation begins. All design decisions are documented; implementation follows [Implementation Roadmap](/docs/10-implementation-roadmap.md).

**Status: ARCHITECTURE COMPLETE — READY FOR IMPLEMENTATION**

***

## 2. Architecture Document Map (48 documents)

### Foundation (01–12)

| #  | Document                      | Domain                          |
| -- | ----------------------------- | ------------------------------- |
| 01 | Architecture Overview         | Strategic layers, RFP alignment |
| 02 | Technology Stack              | Languages, frameworks, infra    |
| 03 | Modular JAR Architecture      | Composable modules              |
| 04 | Database-Driven Configuration | Config store, publish           |
| 05 | Low-Code Admin Platform       | Control plane UI                |
| 06 | Personas and RBAC             | IAM                             |
| 07 | Multi-Country Deployment      | Regional rollout                |
| 08 | Camel Integration Patterns    | Orchestration                   |
| 09 | Security and Compliance       | Policies                        |
| 10 | Implementation Roadmap        | Phased delivery                 |
| 11 | Repository Structure          | Maven layout                    |
| 12 | Glossary                      | Terms                           |

### Design & Patterns (13)

\| 13 | Design Patterns | 40 patterns catalog |

### Platform Libraries (14–21)

\| 14 | Extensibility Framework | Scripts, jobs, EAV | | 15 | File Management System | SFTP, S3, signed URLs | | 16 | Security Library | PGP, Vault, HMAC | | 17 | Monitoring and Logging | OTel, metrics, SLA | | 18 | Execution Context | H2hContext | | 19 | Cloud-Agnostic Deployment | K8s, Helm, **standalone JAR, legacy WAR** | | 20 | Universal Library Extensibility | CustomizationProfile | | 21 | Event-Driven Runtime Extensibility | DB-driven events, subscriptions | | 48 | Utility & Notification Integrations | Email, SMS, push, Slack SPI | | 45 | Database-Agnostic Persistence | `h2h-persistence-spi` | | 46 | Database-Driven Events | `event_def`, `event_channel_def` |

### Domain Architecture (23–31)

\| 23 | Finacle Integration | FCJ, FCUBS, pooling | | 43 | Core Banking Integration API | **CBS base library**; Finacle as provider type | | 24 | Transformation and Messaging | ISO 20022, MT940 | | 25 | ACK/NACK Framework | Acknowledgements | | 26 | Reconciliation | Matching engine | | 27 | Treasury Interfaces | FX, liquidity | | 28 | MQ/JMS Adapter | IBM MQ, Kafka | | 29 | Canonical Data Model | Internal models | | 30 | Database Schema Reference | All tables | | 31 | Error Code Catalog | VAL, FIN, FILE codes |

### Operations & API (32–41)

\| 32 | Performance and Capacity | NFRs, sizing | | 33 | DevSecOps Pipeline | CI/CD, scanning | | 34 | Operations Architecture | Runbooks, DR | | 35 | Testing Strategy | Test pyramid | | 36 | Admin API Reference | REST catalog | | 37 | Partner Portal | External self-service | | 38 | Deployment Topology | Monolith vs split | | 39 | API Gateway Architecture | HTTP REST/SOAP, WebSocket | | 40 | Workflow Architecture | Camunda | | 41 | Training and Handover | RFP training | | 47 | Gateway Entry Points | SFTP, HTTP, WebSocket, MQ |

### Validation (22, 42, 44–48)

\| 22 | Use Cases and Solutions | 22 scenarios mapped | | 42 | Architecture Sign-Off | This document | | 44 | Program Cost and Staffing | Budget, timeline, workforce | | 45 | Database-Agnostic Persistence | PostgreSQL / Oracle / SQL Server | | 46 | Database-Driven Events | Event catalog, channels, partitioning | | 47 | Gateway Entry Points | SFTP, HTTP, WebSocket, MQ | | 48 | Utility & Notification Integrations | Email, SMS, push, Slack |

***

## 3. RFP Coverage Checklist

| RFP requirement                         | Doc(s)             | ✓ |
| --------------------------------------- | ------------------ | - |
| H2H Gateway SFTP/HTTP/WS/MQ             | 01, 15, 28, 39, 47 | ✓ |
| Integration / Camel ESB                 | 03, 08             | ✓ |
| Finacle FCJ/FCUBS                       | 23, 43             | ✓ |
| PGP secure files                        | 15, 16             | ✓ |
| ISO 20022 / MT940                       | 24                 | ✓ |
| Kafka / messaging                       | 21, 28, 46         | ✓ |
| Reconciliation                          | 26                 | ✓ |
| Multi-country HA                        | 07, 19             | ✓ |
| Security & audit                        | 09, 16, 17         | ✓ |
| Low-code / config                       | 04, 05, 20         | ✓ |
| Extensibility                           | 14, 20, 21         | ✓ |
| Treasury / FX                           | 27                 | ✓ |
| Performance / resilience                | 32, 34             | ✓ |
| DevSecOps                               | 33                 | ✓ |
| Training                                | 41                 | ✓ |
| SOAP APIs                               | 39                 | ✓ |
| Partner portal                          | 37                 | ✓ |
| Deployment flexibility                  | 38, 19             | ✓ |
| CBS base library (extensible providers) | 43, 23             | ✓ |

***

## 4. Architecture Gate Questions

| Question                                    | Answer | Doc        |
| ------------------------------------------- | ------ | ---------- |
| Deployable units?                           | Yes    | 38, 11     |
| Config/customization flow?                  | Yes    | 04, 20, 21 |
| Canonical data model?                       | Yes    | 29         |
| Finacle integration?                        | Yes    | 23         |
| Full DB schema?                             | Yes    | 30, 45     |
| Error codes end-to-end?                     | Yes    | 31, 25     |
| Transform standards?                        | Yes    | 24         |
| Reconciliation?                             | Yes    | 26         |
| NFRs / sizing?                              | Yes    | 32         |
| Test strategy?                              | Yes    | 35         |
| DevSecOps?                                  | Yes    | 33         |
| Operations / DR?                            | Yes    | 34         |
| API / partner surfaces?                     | Yes    | 36, 37, 39 |
| Workflows?                                  | Yes    | 40         |
| Training?                                   | Yes    | 41         |
| Broker-delayed jobs (no cron)?              | Yes    | 02, 14     |
| CBS interface + Finacle provider injection? | Yes    | 43, 23     |
| Deployment-agnostic (not Docker-only)?      | Yes    | 19, 38     |
| Database-agnostic persistence?              | Yes    | 45         |
| Database-driven events?                     | Yes    | 46         |
| HTTP + WebSocket ingress?                   | Yes    | 47, 39     |
| Cost / staffing estimate?                   | Yes    | 44         |
| Utility notifications (email, SMS)?         | Yes    | 48         |

**Score: 23/23 — All gates passed.**

***

## 5. Core Architecture Decisions (Locked)

| Decision             | Choice                                                                                    |
| -------------------- | ----------------------------------------------------------------------------------------- |
| Integration engine   | Apache Camel                                                                              |
| Composition model    | Composable JAR modular monolith                                                           |
| Default deployment   | Single `h2h-runtime` per region                                                           |
| Config store         | Database-driven (vendor-agnostic RDBMS), publish workflow                                 |
| Persistence          | PostgreSQL / Oracle / SQL Server via `h2h-persistence-spi`; PostgreSQL default for dev/CI |
| Events (backbone)    | Kafka / RabbitMQ; **database-driven** `event_def` + `event_channel_def`                   |
| Scheduled operations | Broker delay (Kafka / RabbitMQ) — **no in-process cron**                                  |
| Core banking         | **`h2h-core-banking-api` base library** + CBS provider JARs (Finacle default)             |
| Secrets              | HashiCorp Vault                                                                           |
| Identity             | Keycloak RBAC                                                                             |
| Files                | Unified file-mgmt (SFTP + S3 + signed URL)                                                |
| Gateway / ingress    | Database-driven channels: SFTP, HTTP, WebSocket, MQ                                       |
| Extensibility        | CustomizationProfile + SPI plugins                                                        |
| Notifications        | Email, SMS, push via `NotificationProvider` SPI + DB-driven subscriptions                 |
| Deployment           | **Cloud- and deployment-agnostic** — K8s, standalone JAR, or legacy WAR; same modules     |

***

## 5.1 Stakeholder Requirements Traceability

| Requirement                                                  | Status | Primary docs         |
| ------------------------------------------------------------ | ------ | -------------------- |
| Complete architecture before implementation                  | ✓      | 42, 01–47            |
| Broker-delayed scheduled ops (no cron)                       | ✓      | 02 §6.1, 14 §5.3, 21 |
| `CoreBankingIntegration` base library + Finacle CBS provider | ✓      | 43, 23               |
| Deployment-agnostic (K8s, JAR, legacy WAR)                   | ✓      | 19, 38               |
| Database-agnostic application (PG / Oracle / SQL Server)     | ✓      | 45, 14 §6            |
| Database-driven events (topics, partitions from DB)          | ✓      | 46, 21               |
| HTTP + WebSocket gateway entry points                        | ✓      | 47, 39               |
| Program cost, timeline, workforce                            | ✓      | 44, 10               |
| Utility services (email, SMS, push)                          | ✓      | 48, 17               |

***

## 6. Out of Scope (Implementation Phase)

The following are **architecture-complete** but **not yet built**:

* Maven source code and Flyway SQL files
* Helm charts and Terraform modules (designed, not in repo)
* docker-compose for local dev
* OpenAPI YAML exports
* Sample country pack artifacts

These are **Phase 1 implementation** deliverables per [doc 10](/docs/10-implementation-roadmap.md).

***

## 7. Recommended Implementation Start Order

1. Maven parent + `h2h-common` + `h2h-bom`
2. `h2h-config-*` + Flyway V1–V8
3. `h2h-context` + `h2h-security` + `h2h-observability`
4. `h2h-core-banking-api` + `h2h-finacle-wrapper` (mock `CoreBankingIntegration`)
5. `h2h-camel-core` + `h2h-file-management`
6. `h2h-payments-routes` + `h2h-runtime`
7. `h2h-admin-api` + docker-compose
8. First UC-01 sandbox test

***

## 8. Sign-Off

| Role               | Name | Date | Signature |
| ------------------ | ---- | ---- | --------- |
| Solution Architect |      |      |           |
| Platform Lead      |      |      |           |
| Security Architect |      |      |           |
| Business Owner     |      |      |           |

***

## 9. Related Documents

* [README](/docs.md) — Full index
* [10 Implementation Roadmap](/docs/10-implementation-roadmap.md)
* [22 Use Cases and Solutions](/docs/22-use-cases-and-solutions.md)
* [48 Utility & Notification Integrations](/docs/48-utility-notification-integrations.md)


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