The Apollo API offers several key features for managing corporate travel expenses:

1. Expense Tracking: Allows for detailed tracking of travel expenses including flights, accommodations, and ancillary services.

2. Policy Compliance: Ensures that travel bookings adhere to corporate travel policies and guidelines.

3. Reporting and Analytics: Provides comprehensive reporting and analytics tools to monitor and analyze travel expenditures.

4. Integration with Expense Management Systems: Integrates with existing expense management systems to streamline the expense reporting process.

5. Budget Management: Facilitates budget management by tracking spending against predefined budgets and limits.

6. Invoice Management: Supports the management and reconciliation of invoices from travel suppliers.

7. Automated Approval Workflows: Implements automated workflows for travel expense approvals and reimbursements.

For more information, visit Apollo API.

In summary, the key features include expense tracking, policy compliance, reporting, integration with expense systems, budget management, invoice management, and automated approval workflows.