The security requirements for integrating the Apollo API with a corporate booking system include:

1. API Authentication: Implement robust authentication methods such as API keys or OAuth to secure access.

2. Data Encryption: Use encryption protocols (e.g., TLS/SSL) to protect data in transit and at rest.

3. Access Controls: Define and enforce access controls to restrict API usage to authorized users only.

4. Data Privacy: Ensure compliance with data privacy regulations (e.g., GDPR) for handling sensitive customer information.

5. Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential issues.

6. Error Handling: Implement secure error handling and logging practices to monitor and respond to security incidents.

7. API Rate Limiting: Apply rate limiting to prevent abuse and ensure fair usage of the API.

For additional support, Provab’s API Integration Services can assist with securing the Apollo API integration.

In summary, security requirements include API authentication, data encryption, access controls, data privacy, regular audits, error handling, and rate limiting.