This question runs in a pre-configured Salesforce environment - no personal connection required.

Write a method that makes an HTTP callout to fetch user data and return the user's age as an Integer.

You'll need to make a GET request to: https://dummyjson.com/users/{userId}

The API returns JSON in this format:

{
	"id": 1,
	"firstName": "Emily",
	"lastName": "Johnson",
	"age": 28,
	"email": "emily.johnson@x.dummyjson.com",
	"phone": "+81 965-431-3024",
	"username": "emilys",
	"birthDate": "1996-5-30"
}

Examples:

Input: userId = 1 Output: 28 Explanation: User with ID 1 has age 28 Input: userId = 5 Output: 30 Explanation: User with ID 5 has age 30 Input: userId = 999 Output: null Explanation: User with ID 999 does not exist, method returns null
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