To handle different environments (development, staging, production) in API integration, use ______ files in Flutter.

To handle different environments in API integration, Flutter developers often use .env files. These files contain environment-specific configuration settings such as API keys, base URLs, or other parameters. By loading these values dynamically based on the environment, developers can seamlessly switch between development, staging, and production environments without modifying the code. Knowing how to manage environment-specific configurations is essential for building robust and flexible Flutter applications.