curl --request GET \
  --url https://rdp.sh/api/v1/billing/invoices \
  --header 'Authorization: <api-key>'

[
  {
    "id": 123,
    "action": "<string>",
    "gateway": "<string>",
    "netto": 123,
    "brutto": 123,
    "duration": 123,
    "paid": true,
    "delivered": true,
    "server_id": 123,
    "plan_id": 123,
    "created_at": "<string>"
  }
]