This repository documents a public-safe reference architecture for secure external API access in FinTech payment automation platforms. It is inspired by professional FinTech integration experience but does not expose private company systems, product names, source code, customer data, internal APIs, or confidential implementation details.
The goal is to show architecture reasoning for external integrations where security, company-scoped access, auditability, and operational controls are first-class design concerns.
External integration APIs often look simple at the endpoint level, but most of the risk sits behind the endpoint: ownership resolution, tenant isolation, auditability, token lifecycle, and operational failure handling.
I wrote this reference architecture to document the design decisions I consider important when exposing FinTech-style APIs to external systems. The focus is intentionally narrow: API key ownership, company-scoped access, audit logging, rate limiting, and safe operational boundaries.
The repository is not intended to present a full product or implementation. It is a public architecture note showing how I reason about secure integration boundaries in regulated or operationally sensitive software systems.
- Payment automation
- External integration APIs
- API key based access
- Company-scoped data access
- Auditability
- Rate limiting
- Token lifecycle
- Secure operational workflows
- Future scope-based permissions
- Architecture thinking for external FinTech APIs
- Security-aware API design
- Tenant and company scoping
- Audit and operational controls
- API lifecycle considerations
- FinTech domain reasoning
- No private source code
- No customer data
- No real credentials
- No internal API URLs
- No employer-specific infrastructure
- No product names
- No confidential implementation details
- No transaction volume or commercial impact claims
Core documents:
- Artifact purpose
- Architecture overview
- API key authentication
- Company-scoped access
- Audit and rate limiting
- Public safety notes
Architecture decision records:
- ADR-001: API key authentication
- ADR-002: Company-scoped data access
- ADR-003: Audit and rate limiting
This repository is intended as a public reference architecture for discussing secure external API design in FinTech-style systems.
It can be used as a technical writing artifact, architecture discussion material, or a starting point for reviewing API ownership, company-scoped access, audit logging, rate limiting, and token lifecycle decisions.
It should not be treated as production code, a complete implementation, or proof of commercial impact.
Public reference architecture artifact under active review.