Annul invoice

curl --request POST \
  --url https://api.infinity.swiss/v1/invoices/{invoiceId}/annulment \
  --header 'Content-Type: application/json' \
  --header 'x-api-token: <api-key>' \
  --data '
{
  "atDate": "2023-12-25"
}
'

{
  "invoice": {
    "id": "<string>",
    "isDraft": true,
    "number": "<string>",
    "organisation": "<string>",
    "template": "<string>",
    "openingDate": "2023-12-25",
    "dueDate": "2023-12-25",
    "positions": [
      {
        "name": "<string>",
        "singleAmount": 12000,
        "quantity": 2,
        "contraAccount": 5499,
        "id": "<string>",
        "unit": "<string>",
        "articleNumber": "<string>",
        "description": "<string>",
        "date": "<string>",
        "discountRate": 50,
        "customTextColumns": {
          "customTextColumn1": "<string>",
          "customTextColumn2": "<string>",
          "customTextColumn3": "<string>"
        },
        "totalAmount": 123,
        "vatDebt": 123,
        "originalCurrency": "<string>",
        "exchangeRate": 123
      }
    ],
    "totalAmount": 123,
    "totalNetAmount": 123,
    "totalVatDebt": 123,
    "isQrInvoice": true,
    "totalAmountPaid": 123,
    "totalRestAmount": 123,
    "isPaid": true,
    "isOverpaid": true,
    "isAnnulled": true,
    "recipient": "<string>",
    "customRecipientText": "<string>",
    "title": "<string>",
    "payableInDays": 123,
    "introductoryText": "<string>",
    "closingText": "<string>",
    "originalCurrency": "<string>",
    "exchangeRate": 123,
    "columns": [],
    "emailDeliveries": [
      {
        "recipientEmail": "jsmith@example.com",
        "status": "<string>",
        "timestamp": "2023-11-07T05:31:56Z"
      }
    ],
    "publicPdfUrl": "<string>"
  }
}