curl --request GET \
  --url https://{appid}.api-{region}.cometchat.io/v3/groups/{guid}/conversation \
  --header 'apikey: <api-key>' \
  --header 'onBehalfOf: <onbehalfof>'

{
  "data": [
    {
      "conversationId": "group_project-group",
      "conversationType": "group",
      "unreadMessageCount": "0",
      "createdAt": 1630071782,
      "updatedAt": 1630481413,
      "lastMessage": {
        "id": "50",
        "conversationId": "group_project-group",
        "sender": "superhero4",
        "receiverType": "group",
        "receiver": "project-group",
        "category": "action",
        "type": "groupMember",
        "data": {
          "action": "unbanned",
          "entities": {
            "by": {
              "entity": {
                "uid": "superhero4",
                "name": "Wolverine",
                "role": "default",
                "avatar": "https://data-us.cometchat.io/assets/images/avatars/wolverine.png",
                "status": "offline",
                "createdAt": 1629869270
              },
              "entityType": "user"
            },
            "on": {
              "entity": {
                "uid": "superhero3",
                "link": "https://data-us.cometchat.io/assets",
                "name": "Captain America",
                "role": "default",
                "avatar": "https://data-us.cometchat.io/assets/images/avatars/captainamerica.png",
                "status": "offline",
                "createdAt": 1629869270,
                "updatedAt": 1629964825,
                "conversationId": "superhero3_user_superhero4"
              },
              "entityType": "user"
            },
            "for": {
              "entity": {
                "guid": "project-group",
                "icon": "http://placehold.it/120x120&text=image1",
                "name": "Project Group1",
                "type": "private",
                "owner": "superhero4",
                "createdAt": 1630071341,
                "updatedAt": 1630305525,
                "updatedBy": "superhero4",
                "description": "project related discussions between members",
                "membersCount": 4,
                "conversationId": "group_project-group"
              },
              "entityType": "group"
            }
          }
        },
        "sentAt": 1630305562,
        "updatedAt": 1630305562
      },
      "conversationWith": {
        "guid": "project-group",
        "name": "Project Group1",
        "description": "project related discussions between members",
        "icon": "http://placehold.it/120x120&text=image1",
        "type": "private",
        "scope": "participant",
        "membersCount": 4,
        "joinedAt": 1630071782,
        "conversationId": "group_project-group",
        "hasJoined": true,
        "createdAt": 1630071341,
        "owner": "superhero4",
        "updatedAt": 1630308875,
        "updatedBy": "superhero4"
      }
    }
  ]
}