Open Messaging API: Quick Reply payload structure for cards

NICE CXone API & Integrations
1

Hey folks,
Trying to push a structured card with quick replies via the Open Messaging API. I’m using POST /api/v2/conversations/{conversationId}/messages, but the quick replies aren’t rendering as buttons. Here’s the snippet I’m sending:

{
 "toId": "user:123",
 "type": "card",
 "body": "Choose an option",
 "quickReplies": [{"label": "Option A"}]
}

Am I missing a field or is the structure wrong? Getting a 200 OK but the UI just shows text.