curl --request POST \
  --url http://localhost:8080/cabinet/admin/users/{user_id}/subscription \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": "<string>",
  "days": 1825,
  "end_date": "2023-11-07T05:31:56Z",
  "tariff_id": 123,
  "traffic_limit_gb": 1,
  "traffic_used_gb": 1,
  "autopay_enabled": true,
  "traffic_gb": 2,
  "traffic_purchase_id": 123,
  "is_trial": true,
  "device_limit": 2
}
'

{
  "success": true,
  "message": "<string>",
  "subscription": {
    "id": 123,
    "status": "<string>",
    "is_trial": true,
    "start_date": "2023-11-07T05:31:56Z",
    "end_date": "2023-11-07T05:31:56Z",
    "traffic_limit_gb": 0,
    "traffic_used_gb": 0,
    "device_limit": 1,
    "tariff_id": 123,
    "tariff_name": "<string>",
    "autopay_enabled": false,
    "is_active": false,
    "days_remaining": 0,
    "purchased_traffic_gb": 0,
    "traffic_purchases": []
  }
}