On 12.20.2023, a new version of the delivery service was implemented allowing to directly retrieve the associated invoice number. The additional field is available as fiscalDocumentNumber:
[
{
"id": "193834/AAA/2024",
"orderId": "154548/AAA/2024",
"billTo": "112790",
"shipTo": "112790",
"shipFrom": "AAA",
"deliveryMethod": "I",
"creationDate": "2024-04-11T13:23:20+02:00",
"currencyCode": "PLN",
"fiscalDocumentNumber": "00037557/AAA/24/F",
"lines": [
{
"index": "111 2222 31",
"sku": "AAAAAA",
"name": "Rozrząd kpl. (pasek + rolka + pompa cieczy)",
"shippedQuantity": 1,
"returnedQuantity": 0,
"unitPriceNet": 265.05,
"unitPriceGross": 326.01,
"vatPercentage": 23,
"totalNet": 265.05,
"totalGross": 326.01
}
]
}
]