curl --request POST \
  --url 'https://api.stateset.com/api/v1/a2a/messages' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "conversation_id": null,
  "from_agent_id": "string",
  "message_type": "string",
  "payload": {},
  "to_agent_id": "string"
}'

{
  "attempts": 1,
  "conversation_id": "string",
  "created_at": "string",
  "from_agent_id": "string",
  "id": "string",
  "message_type": "string",
  "sequence_number": 1,
  "status": "string",
  "to_agent_id": "string"
}