Expense Service

Business logic service that manages expense creation, validation, and submission workflows. Fetches expense type definitions and mutual-exclusivity rules from the API, applies threshold-based auto-approval logic locally for optimistic UI, and submits expenses to the backend approval state machine (submitted → auto-approved / pending-review → approved / rejected).

Feature: Travel Expense Registration

expense-service

• Fetch and cache expense type definitions with mutual-exclusivity rules
• Validate expense data against business rules before submission
• Submit expense claims to the REST API for approval routing
• Track expense submission status through the approval state machine
• Calculate total reimbursement amounts from individual line items