{
  "subscribers": [
    {
      "subscriberId": "subscriber_001",
      "email": "a@example.com",
      "firstName": "Alice"
    },
    {
      "subscriberId": "subscriber_002",
      "email": "b@example.com",
      "firstName": "Bob"
    },
    {
      "subscriberId": "subscriber_003",
      "email": "c@example.com",
      "firstName": "Carol"
    }
  ]
}