curl --request GET \
  --url https://{appid}.api-{region}.cometchat.io/v3/messages/{id} \
  --header 'apikey: <api-key>'

{
  "data": {
    "id": "1",
    "conversationId": "superhero3_user_superhero5",
    "sender": "superhero3",
    "receiverType": "user",
    "receiver": "superhero5",
    "category": "message",
    "type": "text",
    "data": {
      "text": "test     hello",
      "metadata": {
        "key1": "val1"
      },
      "entities": {
        "sender": {
          "entity": {
            "uid": "superhero3",
            "name": "Spiderman",
            "avatar": "https://data-us.cometchat.io/assets/images/avatars/spiderman.png",
            "status": "offline",
            "role": "default",
            "createdAt": 1638361550
          },
          "entityType": "user"
        },
        "receiver": {
          "entity": {
            "uid": "superhero5",
            "name": "Cyclops",
            "avatar": "https://data-us.cometchat.io/assets/images/avatars/cyclops.png",
            "status": "offline",
            "role": "default",
            "createdAt": 1638361550,
            "conversationId": "superhero3_user_superhero5"
          },
          "entityType": "user"
        }
      }
    },
    "sentAt": 1638423490,
    "updatedAt": 1638423490
  }
}