curl --request POST \
  --url https://api.morphic.io/api/chats/{chat_id}/messages \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "role": "<string>",
  "content": "<string>",
  "attachments": {},
  "metadata": {}
}
'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "role": "<string>",
  "content": "<string>",
  "chat_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "attachments": {},
  "metadata": {}
}