curl --request GET \
  --url https://api.example.com/api/v1/contacts/groups/{group_id}

{
  "group": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "member_count": 123,
    "created_at": "<string>",
    "description": "<string>"
  },
  "contacts": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "phone_number": "<string>",
      "source": "<string>",
      "is_opted_out": true,
      "tags": [
        "<string>"
      ],
      "created_at": "<string>",
      "name": "<string>",
      "email": "<string>",
      "whatsapp_name": "<string>",
      "profile_picture_url": "<string>",
      "source_details": "<string>",
      "last_message_at": "<string>"
    }
  ],
  "total": 123,
  "limit": 123,
  "offset": 123
}