Expense Approval Service

Backend service exposing PATCH endpoints for approve, reject, and request-clarification actions on expense claims. Validates actor role and organizational scope, writes results to reimbursement_approvals with actor ID and timestamp, appends to audit_logs, and triggers notification dispatch.

Feature: Expense Approval Queue

expense-approval-service

• Validate requesting actor has coordinator or org-admin role with correct org/association scope
• Apply approval, rejection, or clarification-request action to reimbursement_approvals record
• Record actor ID, timestamp, and optional rejection reason on each action
• Emit audit log entry for every approval action for compliance traceability
• Trigger notification to expense submitter after each action