Travel Expense Registration

Travel reimbursement is a core operational concern for HLF and Blindeforbundet, where peer mentors regularly incur out-of-pocket travel costs and need a reliable, low-friction way to claim them back. Today the process is paper-driven and inconsistent, leading to delayed reimbursements, frustrated volunteers, and accounting errors. Digitalising expense registration directly inside the activity flow ties costs to verifiable activities, improves transparency for coordinators and admins, and makes downstream accounting integration (Xledger, Dynamics) materially easier. The structured capture also reduces fraud risk and supports clean Bufdir-aligned financial reporting.

Implement a Flutter form on mobile with offline-first persistence via Drift and the mutation outbox so expenses can be entered without connectivity and synced later. Expense records reference the activity ID and expense_type ID; validation runs both client- and server-side to enforce mutually exclusive type combinations. Backend exposes REST endpoints under /api/v1/expenses with tenant scoping and module-toggle gating on expense-reimbursement. Threshold-based auto-approval rules are applied server-side at submission time. Distance computation for kilometer claims uses user-entered start/end values; no automatic geocoding in the initial release.