EET

EET stands for Elektronická Evidence Tržeb, which is Czech version of Fiscal Printers. It's an online API provided by the Ministry of Finance in a form of a SOAP Web Service.

Key features

• No Czech abbreviations.
• Early data validation.
• Intuitive immutable DTOs.

Known issues

• As the communication is done fully via HTTPS, we postponed the implementation of response signature verification. It's a potential security risk that will be addressed in upcoming releases.

Usage

We tend to use immutable DTOs wherever possible, especially to ensure data validity. We want the library to throw an error as soon as possible, i.e. when constructing corresponding data structures. That is why we even introduce wrappers for simple datatypes. Various usages are demonstrated in our test cases.

Simplest usage example

var certificate = new Certificate(
    password: "certificatePassword",
    data: certificateContentsByteArray
);

var record = new RevenueRecord(
    identification: new Identification(
        taxPayerIdentifier: new TaxIdentifier("CZ1234567890"),
        registryIdentifier: new RegistryIdentifier("01"),
        premisesIdentifier: new PremisesIdentifier(1),
        certificate: certificate
    ),
    revenue: new Revenue(
        gross: new CurrencyValue(1234.00m)
    ),
    billNumber: new BillNumber("2016-321")
);

var client = new EetClient(certificate);
var response = client.SendRevenue(record);
if (response.IsSuccess)
{
    var fiscalCode = response.Success.FiscalCode;
}

Authors

Development: @jirihelmich

Code review: @siroky, @onashackem

The time to implement this was kindly provided by Mews Systems.