Integration & Communication Requirements
Purpose
To ensure technological sovereignty and seamless interoperability by standardizing how systems communicate and interact with external dependencies while minimizing vendor lock-in and enabling provider replacement.
Scope
Service-to-service communication patterns, third-party integration abstractions, event and messaging standards, integration testing approaches, and protocol standardization.
Requirements
| ID | Name | Description |
|---|---|---|
| REQ-INT-1 | Integration Abstraction | All integrations with other systems MUST be encapsulated behind well-defined interfaces or adapters, keeping core domain logic free of external-specific details. |
| REQ-INT-2 | Provider Replaceability | Integration code MUST depend on stable abstractions so underlying providers (internal or external) can be replaced without changes to domain logic. |
| REQ-INT-3 | Contract-Only Integration Testing | Integration testing MUST use only public contracts of integrated products and MUST NOT require coordination, changes, or internal access in those products. |
| REQ-INT-4 | Versioned Messaging Contracts | Event, message, and webhook formats used for cross-product communication MUST be documented, versioned, and stable. |
| REQ-INT-5 | Loose Coupling Patterns | Communication patterns MUST favour loose coupling (events, asynchronous messaging) where appropriate to reduce runtime dependencies and failure propagation. |
| REQ-INT-6 | Standard Protocols | External platforms MUST be able to integrate using standard protocols (HTTP/REST, events) without custom tunnels or non-standard integrations. |
Reference Template
TBD — a reference example for this standard is pending (to be crafted).