curl --request GET \
  --url https://panel.sendcloud.sc/api/v2/user/invoices/{id} \
  --header 'Authorization: Basic <encoded-value>'

{
  "invoice": {
    "id": 1,
    "ref": "EU-CENTRAL-0-1-22-NL0000001",
    "type": "periodic",
    "price_incl": 0,
    "price_excl": 0,
    "isPayed": true,
    "date": "05-10-2020 02:12:01",
    "items": [
      {
        "id": 33493679,
        "name": "PostNL Standard 0-23kg"
      },
      {
        "id": 33493681,
        "name": "Insurance"
      },
      {
        "id": 33495701,
        "name": "Credit requested for label"
      },
      {
        "id": 33495702,
        "name": "Insurance refund"
      }
    ]
  }
}