C4 Level 1 — System Context
Who uses the system and what external systems does it connect to.
Users
| Actor | Role | Interaction |
|---|---|---|
| Employee | Day-to-day user | Chat via Slack/Teams, forward receipts, ask questions |
| Accountant / CFO | Power user | Dashboard, configure rules, review flagged items |
| Company Owner | Consumer | Analytics, reports, cost overview |
External Systems
| System | Purpose | Integration |
|---|---|---|
| Tripletex | Accounting system (full ERP) | REST API v2, OAuth2 |
| Fiken | Accounting system (SMB-focused) | REST API v2, OAuth2 |
| Slack / Teams | Employee chat interface | Bot API (webhook + events) |
| Receive forwarded invoices and receipts | IMAP polling or email webhook |