 // To secure Facebook Graph API requests:
// - Create a SHA256 hash of your App's Access Token using the App's 'Secret' as the key
// - The hashed value then needs to be added to an 'appsecret_proof' parameter on each Graph API call request
// - Toggle 'Require App Secret' to 'ON' in App dashboard Developer Portal
 
// Require 'crypto' package as part of Node
const crypto = require('crypto');
 
// Create HMAC object:
// - Algorithim: 'SHA256'
// - Key: Facebook App Secret
const hmac = crypto.createHmac('sha256', config.FB_appSecret);
 
// Provide HMAC Facebook Access Token as content to be hashed
hmac.update('config.FB_accessToken');
 
// Calculate HMAC digest with hexadecimal encoding and log to console
// In production you would store the output, not log it to console
console.log(hmac.digest('hex'));

	// To secure Facebook Graph API requests:
	// - Create a SHA256 hash of your App's Access Token using the App's 'Secret' as the key
	// - The hashed value then needs to be added to an 'appsecret_proof' parameter on each Graph API call request
	// - Toggle 'Require App Secret' to 'ON' in App dashboard Developer Portal

	// Require 'crypto' package as part of Node
	const crypto = require('crypto');

	// Create HMAC object:
	// - Algorithim: 'SHA256'
	// - Key: Facebook App Secret
	const hmac = crypto.createHmac('sha256', config.FB_appSecret);

	// Provide HMAC Facebook Access Token as content to be hashed
	hmac.update('config.FB_accessToken');

	// Calculate HMAC digest with hexadecimal encoding and log to console
	// In production you would store the output, not log it to console
	console.log(hmac.digest('hex'));