Integration framework Open API endpoint and documentation

To enable and foster external integrations with the addressing database from third party applications the national addressing system will offer a dedicated API for integrations.

• Database Integration
• The API may either:
• Reuse the existing addressing database by adding a new schema, or
• Operate on a dedicated database instance populated from the production data model.
• An ETL (Extract, Transform, Load) procedure must be designed and implemented to populate the integration database and keep it continuously updated with changes from the production system.
• Technology Stack
• The API shall be implemented in either Python (FastAPI) or .NET Core, at the vendor’s discretion.
• The design should prioritize modularity, maintainability, and alignment with modern development best practices (e.g., OpenAPI specification, REST principles, containerization readiness).
• Performance and Scalability
• The API must be dimensioned to handle high traffic volumes and frequent large queries without degradation of service.
• Performance optimization measures (e.g., indexing, caching, query tuning, load balancing) should be included.
• The solution should support horizontal scaling if required.
• Security and Access Control
• Authentication and authorization must be integrated with the existing OIDC identity provider.
• The API should support self-registration workflows, either by directly consuming the OIDC registration API or by proxying it via a custom UI.
• Data access must comply with agreed policies on privacy, data protection, and auditability.

The API must expose endpoints covering the following key use cases:

• Bulk Data Access
  • Download the complete set of addressing data in structured formats suitable for third-party consumption.
• Incremental Data Updates
  • Retrieve change sets for addressing data since a user-specified date/time.
  • Support for high-frequency incremental updates for near real-time synchronization.
• Database Synchronization
  • Provide services to synchronize and mirror the central addressing database into decentralized instances.
  • Include retry and recovery mechanisms to ensure data consistency.
• Search and Query Services
  • Free-text search across addressing records with relevance ranking.
  • Structured queries using address components (e.g., region, street, building).
• Reference Data Access
  • Expose relevant code lists (e.g., administrative units, street types, address statuses) as web services.
• Documentation and Developer Resources
  • Provide comprehensive API documentation following the Open API/Swagger standard.
  • Include tutorials, examples, and best practices for integration.
  • Contribute content for the Addressing Wiki, offering guidance for developers and integrators on how to use the API.

• Fully functional and tested Integration Framework API.
• ETL scripts/procedures to maintain synchronization between production and integration databases.
• Open API specification file and interactive API documentation (Swagger UI or equivalent).
• Developer documentation, tutorials, and content for the Addressing Wiki.
• Deployment guidelines and system administration documentation.
• Security and performance testing reports.
• An addressing integration 101 example that describes all the steps involved to create an integration with the system