curl --request POST \
  --url http://localhost:8080/users/{user_id}/subscription \
  --header 'Content-Type: application/json' \
  --data '
{
  "is_trial": false,
  "duration_days": 123,
  "traffic_limit_gb": 123,
  "device_limit": 123,
  "squad_uuid": "<string>",
  "connected_squads": [
    "<string>"
  ],
  "replace_existing": false
}
'

{
  "id": 123,
  "status": "<string>",
  "language": "<string>",
  "balance_kopeks": 123,
  "balance_rubles": 123,
  "has_had_paid_subscription": true,
  "has_made_first_topup": true,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "telegram_id": 123,
  "username": "<string>",
  "first_name": "<string>",
  "last_name": "<string>",
  "referral_code": "<string>",
  "referred_by_id": 123,
  "last_activity": "2023-11-07T05:31:56Z",
  "promo_group": {
    "id": 123,
    "name": "<string>",
    "server_discount_percent": 123,
    "traffic_discount_percent": 123,
    "device_discount_percent": 123,
    "apply_discounts_to_addons": true
  },
  "subscription": {
    "id": 123,
    "status": "<string>",
    "actual_status": "<string>",
    "is_trial": true,
    "start_date": "2023-11-07T05:31:56Z",
    "end_date": "2023-11-07T05:31:56Z",
    "traffic_limit_gb": 123,
    "traffic_used_gb": 123,
    "device_limit": 123,
    "autopay_enabled": true,
    "autopay_days_before": 123,
    "subscription_url": "<string>",
    "subscription_crypto_link": "<string>",
    "connected_squads": [
      "<string>"
    ]
  }
}