curl --request POST \
  --url https://api.veryfront.com/conversations/{conversation_id}/participants \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "role": "member"
}
'

{
  "id": "<string>",
  "conversation_id": "<string>",
  "notification_preference": "<string>",
  "joined_at": "<string>",
  "participant_id": "<string>",
  "participant_type": "user",
  "user_id": "<string>",
  "agent_id": "<string>",
  "display_name": "<string>",
  "avatar_url": "<string>",
  "last_read_message_id": "<string>"
}