<p>Adds additional customer communication to an Amazon Web Services Support case. Use the <code>caseId</code> parameter to identify the case to which to add communication. You can list a set of email addresses to copy on the communication by using the <code>ccEmailAddresses</code> parameter. The <code>communicationBody</code> value contains the text of the communication.</p> <note> <ul> <li> <p>You must have a Business, Enterprise On-Ramp, or Enterprise Support plan to use the Amazon Web Services Support API. </p> </li> <li> <p>If you call the Amazon Web Services Support API from an account that doesn't have a Business, Enterprise On-Ramp, or Enterprise Support plan, the <code>SubscriptionRequiredException</code> error message appears. For information about changing your support plan, see <a href="http://aws.amazon.com/premiumsupport/">Amazon Web Services Support</a>.</p> </li> </ul> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}