Implement a corporate travel policy enforcement engine

Steps

1. Define your policy rule set as structured configuration: maximum fare thresholds by cabin class and route distance, preferred airline/hotel vendor lists, advance booking requirements, and approval workflows.
2. At search time, tag each result with a policy compliance status (in-policy, out-of-policy-with-reason, requires-approval) by evaluating the offer price and attributes against the traveler's policy tier.
3. For out-of-policy selections, capture a justification code from the traveler (e.g., lowest-cost-not-available, meeting-requirement) before allowing the booking to proceed.
4. For selections requiring manager approval, create an approval request record with all offer details and a deeplink back to the booking; notify the approver via email or your HR system webhook.
5. Once approved, re-check the offer is still available and within a price tolerance of the original quote before completing the booking, since fares change during approval delays.
6. Write a compliance event to your reporting store for every booking, capturing the policy decision, justification, approver, and final cost for management reporting.