curl --request GET \
  --url https://api.gcore.com/billing/org/v1/expenses/{id} \
  --header 'Authorization: <api-key>'

{
  "id": 123,
  "client_id": 123,
  "payer_id": 123,
  "client": {
    "id": 123,
    "company_name": "<string>"
  },
  "comment": "<string>",
  "for_date": "2023-11-07T05:31:56Z",
  "period_range": {
    "start": "2023-11-07T05:31:56Z",
    "end": "2023-11-07T05:31:56Z"
  },
  "calc_rule_type": "<string>",
  "currency": {
    "id": 123,
    "char_code": "<string>",
    "symbol": "<string>"
  },
  "money_value": "<string>",
  "tax_value": "<string>",
  "tax_rate": "<string>",
  "usage": {
    "amount": "<string>",
    "unit_name": "<string>"
  },
  "metric_ext_name": "<string>",
  "region": {
    "id": 123,
    "name": "<string>",
    "external_name": "<string>"
  },
  "discount_value": "<string>",
  "discount": {
    "id": 123,
    "relative_value": "<string>",
    "comment": "<string>"
  },
  "deleted": true,
  "description": "<string>",
  "product_category": {
    "id": 123,
    "name": "<string>"
  },
  "product": {
    "id": 123,
    "name": "<string>",
    "internal_name": "<string>"
  },
  "addendum": {
    "id": 123,
    "active_range": {
      "start": "2023-11-07T05:31:56Z",
      "end": "2023-11-07T05:31:56Z"
    },
    "status": "upcoming"
  },
  "plan": {
    "id": 123,
    "name": "<string>"
  },
  "feature": {
    "id": 123,
    "name": "<string>",
    "erp_sku_id": "<string>"
  },
  "subscription": {
    "id": 123,
    "active_range": {
      "start": "2023-11-07T05:31:56Z",
      "end": "2023-11-07T05:31:56Z"
    }
  },
  "plan_item": {
    "id": 123,
    "default": true,
    "comment": "<string>",
    "description": "<string>"
  },
  "invoices": [
    {
      "invoice_id": 123,
      "invoice_date": "2023-12-25",
      "invoice_item_id": 123
    }
  ]
}