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API Security Best Practices: 1. Authentication and Authorization: Implement robust authentication and authorization mechanisms, such as OAuth, JWT, or Basic Auth. 2. Data Encryption: Use HTTPS (TLS/SSL) to encrypt data in transit. 3. Input Validation: Validate user input to prevent SQL injection, cross-site scripting (XSS), and other attacks. 4. Rate Limiting: Implement rate limiting to prevent brute-force attacks and denial-of-service (DoS) attacks. 5. Error Handling: Implement robust error han