Pushing a quick reply card via POST /api/v2/conversations/messaging/messages returns a 200 OK, but the guest only receives the text fallback. The trace spans show no errors, yet the content block with type: "card" vanishes from the delivery log.
{
"content": {
"type": "card",
"text": "Select option",
"actions": [{"type": "quickReply", "text": "Yes"}]
}
}
Am I missing a specific header for structured content?