When integrating the HitchHiker API with a travel booking website, the following security measures should be in place:

1. API Key Management: Use API keys to authenticate and authorize access to the API.

2. Secure Data Transmission: Implement SSL/TLS encryption to protect data during transmission.

3. Access Controls: Implement role-based access controls to restrict access to sensitive data and functionality.

4. Rate Limiting: Apply rate limiting to prevent abuse and protect the API from excessive requests.

5. Monitoring and Logging: Monitor API usage and maintain logs for security auditing and incident response.

6. Data Validation: Validate all input and output data to prevent injection attacks and other security vulnerabilities.

7. Regular Security Updates: Keep the API and related systems updated with the latest security patches.

8. User Authentication: Implement strong user authentication mechanisms to secure user accounts and data.

For more information, visit HitchHiker API.

In summary, key security measures include API key management, secure data transmission, access controls, rate limiting, monitoring, data validation, regular updates, and user authentication.