curl --request POST \
  --url https://{appid}.api-{region}.cometchat.io/v3/data_import/members \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '{
  "members": {
    "guid1_member_uid2": {
      "memberId": "guid1_member_uid2",
      "uid": "uid2",
      "guid": "guid1",
      "joinedAt": "1673421419",
      "scope": "admin",
      "groupDetails": {
        "guid": "guid1",
        "name": "guid1",
        "type": "public",
        "owner": "uid1",
        "createdAt": "1673421419"
      },
      "userDetails": {
        "uid": "uid2",
        "name": "uid2"
      }
    }
  }
}'

{
  "data": {
    "guid1_member_uid2": {
      "success": true,
      "data": {
        "guid": "guid1",
        "uid": "uid2",
        "scope": "admin",
        "joinedAt": 1673421419
      }
    }
  }
}