curl --request GET \
  --url https://api.altera.co/sales/invoice \
  --header 'Authorization: <api-key>'

{
  "invoice": {
    "modelType": "INVOICE",
    "readOnly": false,
    "basicInformation": {
      "invoiceId": 118584,
      "invoiceType": "PRO_FORMA",
      "invoiceFormat": "PRO %N/%M/%Y",
      "invoiceNumber": "PRO 2/12/2022",
      "year": 2022,
      "month": 12,
      "invoiceNumberInPeriod": 2,
      "statusId": "SENT",
      "isReceipt": false,
      "isRelated": false,
      "netPrice": 5760,
      "grossPrice": 7084.8,
      "currency": "PLN",
      "exchangeRate": 1,
      "vatPLN": 1324.8,
      "issueDate": "2022-12-27T00:00:00.000Z",
      "saleDate": "2022-12-27T00:00:00.000Z",
      "uploadDate": "2022-12-27T08:52:22.000Z",
      "relatedInvoicesIds": [],
      "priceTypeId": "NET"
    },
    "contractor": {
      "contractorName": "American Water Works Company, Inc.",
      "contractorId": 106,
      "taxIdentificationNumber": "3748414103",
      "country": "PL",
      "contractorType": "COMPANY",
      "contractorRegion": "POLAND",
      "defaultCurrency": "PLN",
      "city": "Norton Canes",
      "street": "Dezsez View",
      "houseNumber": "396",
      "flatNumber": "154",
      "postCode": "97-135",
      "email": "went@able.com,fv@altera.co",
      "phoneNumber": "420577850",
      "areaNumber": ""
    },
    "buyer": {
      "contractorName": "American Water Works Company, Inc.",
      "contractorId": 106,
      "taxIdentificationNumber": "3748414103",
      "country": "PL",
      "contractorType": "COMPANY",
      "contractorRegion": "POLAND",
      "defaultCurrency": "PLN",
      "city": "Norton Canes",
      "street": "Dezsez View",
      "houseNumber": "396",
      "flatNumber": "154",
      "postCode": "97-135",
      "email": "went@able.com,fv@altera.co",
      "phoneNumber": "420577850",
      "areaNumber": ""
    },
    "seller": {
      "taxIdentificationNumber": "1397887352",
      "contractorName": "Express Scripts Inc."
    },
    "payments": {
      "paymentMethod": "TRANSFER",
      "dueDate": "2023-01-26T00:00:00.000Z",
      "isSplitPayment": false,
      "isPaid": false,
      "paidAmount": 0,
      "bankAccountNumber": "29 1111 1111 1111 1111 1111 1111"
    },
    "invoicePosition": [
      {
        "invoiceProductId": 57822,
        "positionType": "SERVICE",
        "productPosition": 0,
        "productCategory": "Facebook",
        "productCategoryId": 808,
        "productName": "Facebook Ads",
        "unit": "szt.",
        "unitNetPrice": 480,
        "unitGrossPrice": 590.4,
        "quantity": 12,
        "discount": 0,
        "vat": "23%",
        "priceNet": 5760,
        "netPrice": "5760",
        "vatAmt": 1324.8,
        "priceGross": 7084.8,
        "grossPrice": "7084.8",
        "gtu": "-",
        "deductions": true
      }
    ],
    "attachments": [
      {
        "id": 41660,
        "fileName": "1_3_2022_1.pdf",
        "fileSize": 26968
      }
    ],
    "costCenterPerItem": false,
    "accounting": {
      "vatProcedures": [],
      "isSubjectToVat": true,
      "activeVat": true
    }
  },
  "defaults": {
    "suggestedProducts": [
      {
        "productId": 780,
        "productName": "Facebook Ads"
      },
      {
        "productId": 781,
        "productName": "Google Ads"
      },
      {
        "productId": 779,
        "productName": "Prowadzenie FP"
      }
    ],
    "suggestedContractor": [
      {
        "contractorId": 106,
        "tinCountry": "PL",
        "tin": "3748414103",
        "name": "American Water Works Company, Inc.",
        "contractorType": "COMPANY"
      },
      {
        "contractorId": 104,
        "tinCountry": "PL",
        "tin": "4387990234",
        "name": "Whirlpool Corporation",
        "contractorType": "COMPANY"
      },
      {
        "contractorId": 87,
        "tinCountry": "PL",
        "tin": "2231185845",
        "name": "World Fuel Services Corporation",
        "contractorType": "COMPANY"
      }
    ],
    "suggestedCategories": [
      {
        "categoryName": "Google"
      },
      {
        "categoryName": "Facebook"
      },
      {
        "categoryName": ""
      }
    ],
    "suggestedReasons": [
      "Brak adnotacji \"mechanizm podzielonej płatności\"",
      "Pomyłka w cenie",
      "Pomyłka w dacie",
      "Pomyłka w danych nabywcy",
      "Pomyłka w ilości",
      "Pomyłka w kwocie",
      "Pomyłka w opisie",
      "Pomyłka w stawce VAT",
      "Rabat",
      "Reklamacja",
      "Zwrot towaru / płatności"
    ],
    "units": [
      "szt.",
      "godz",
      "dni",
      "kg",
      "mb"
    ],
    "pkwiu": [],
    "vatPcs": [
      {
        "name": "23%",
        "value": 0.23
      },
      {
        "name": "8%",
        "value": 0.08
      },
      {
        "name": "5%",
        "value": 0.05
      },
      {
        "name": "zw",
        "nameEN": "exempt.",
        "value": 0
      },
      {
        "name": "np",
        "nameEN": "reverse charge",
        "value": 0
      },
      {
        "name": "0%",
        "value": 0
      }
    ]
  },
  "relatedInvoices": []
}