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// index.js or app.js
// ------------------

// In a real application, you would load dotenv at the very beginning
// to ensure environment variables are available throughout your app.
// For production, ensure these variables are set directly in your hosting environment.
import 'dotenv/config'; // For Node.js, install with `npm install dotenv` and use `node -r dotenv/config your_app.js` or `import 'dotenv/config'`

// Access API keys from environment variables
const MY_API_KEY = process.env.ORG_API_KEY;
const ANOTHER_SERVICE_SECRET = process.env.ANOTHER_SERVICE_SECRET;

function makeSecureApiCall(endpoint, data) {
  if (!MY_API_KEY) {
    console.error("ORG_API_KEY environment variable is not set.");
    return Promise.reject(new Error("API key missing."));
  }

  // Example of using the API key in a fetch request
  return fetch(endpoint, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${MY_API_KEY}` // Common pattern for API key authentication
      // Or sometimes: 'x-api-key': MY_API_KEY
    },
    body: JSON.stringify(data)
  })
  .then(response => {
    if (!response.ok) {
      throw new Error(`API call failed: ${response.status} ${response.statusText}`);
    }
    return response.json();
  })
  .catch(error => {
    console.error(`Error during API call to ${endpoint}:`, error);
    throw error;
  });
}

// How to set environment variables (e.g., in .env file for local development):
// --------------------------------------------------------------------------
// .env file (DO NOT COMMIT THIS FILE TO VERSION CONTROL):
// ORG_API_KEY="your_super_secret_api_key_123"
// ANOTHER_SERVICE_SECRET="another_secret_value_xyz"

// In a shell before running your app:
// export ORG_API_KEY="your_super_secret_api_key_123"
// export ANOTHER_SERVICE_SECRET="another_secret_value_xyz"
// node index.js

// Example Usage:
// (async () => {
//   try {
//     const result = await makeSecureApiCall("https://api.example.com/data", { item: "new item" });
//     console.log("API call successful:", result);
//   } catch (error) {
//     console.error("API call failed:", error.message);
//   }
// })();