e-invoicing

Introduction

e-invoicing is a library to generate and read data of specifications which comply with the EN16931. It is possible to generate CIUS like XRechnung, Peppol BIS Billing and ZUGFeRD / factur-x.

Usage

composer require easybill/e-invoicing

Example: EN16931 Cross Industry Invoice

In this example we generate a normal EN16931 as Cross Industry Invoice.

use easybill\eInvoicing\CII\Documents\CrossIndustryInvoice;
use easybill\eInvoicing\CII\Models\DocumentContextParameter;
use easybill\eInvoicing\CII\Models\ExchangedDocument;
use easybill\eInvoicing\CII\Models\ExchangedDocumentContext;
use easybill\eInvoicing\CII\Models\DateTime;
use easybill\eInvoicing\Transformer;

$document = new CrossIndustryInvoice();
$document->exchangedDocument = new ExchangedDocument();
$document->exchangedDocumentContext = new ExchangedDocumentContext();
$document->exchangedDocumentContext->documentContextParameter = new DocumentContextParameter();
$document->exchangedDocumentContext->documentContextParameter->id = 'urn:cen.eu:en16931:2017';
$document->exchangedDocument->id = '471102';
$document->exchangedDocument->issueDateTime = DateTime::create(102, '20200305');
// etc...
$xml = Transformer::create()->transformToXml($document)

Example: EN16931 Universal Business Language Invoice

In this example we generate a CIUS (XRechnung 3.0) as UBL document

use easybill\eInvoicing\Transformer;
use easybill\eInvoicing\UBL\Documents\UblInvoice;
use easybill\eInvoicing\Enums\CurrencyCode;
use easybill\eInvoicing\Enums\DocumentType;

$document = new UblInvoice();
$document->customizationId = 'urn:cen.eu:en16931:2017#compliant#urn:xeinkauf.de:kosit:xrechnung_3.0';
$document->profileId = 'urn:fdc:peppol.eu:2017:poacc:billing:01:1.0';
$document->id = '123456XX';
$document->issueDate = '2016-04-04';
$document->invoiceTypeCode = DocumentType::COMMERCIAL_INVOICE;
$document->documentCurrencyCode = CurrencyCode::EUR;
$document->buyerReference = '04011000-12345-03';
// etc...
$xml = Transformer::create()->transformToXml($document)

Example: Reading an unknown XML file

There might be the case that you receive some XML which may or may not be supported by this library. e-invoicing offers a handy way to just parse that XML and see if is deserializable to UBL or CII.

use easybill\eInvoicing\Reader;
use easybill\eInvoicing\CII\Documents\CrossIndustryInvoice;

$xml = file_get_contents($exampleXmlFile);

$readerResult = Reader::create()->read($xml);

// If the format is supported and valid in its structure the following check will be true
$readerResult->isSuccess()

// If the format is not supported or a different error occurred the result will have the state error.
$readerResult->isError()

// If it's valid you may retrieve the deserialized object from the dto.
// Invoking the getDocument method on an error will result in a LogicException
$document = $readerResult->getDocument(); 

if ($document instanceof CrossIndustryInvoice) {
    // do something with the CrossIndustryInvoice
}

You can refer to the tests in this repository for examples of using this library.

Customization

This library offers some degree of customization. You may create a customized Reader, Transformer or Writer. By default, the library does not trim whitespaces around values. This is true for values which do not end as enums. If you want to add that the functionality to trim the values you may refer to this test.

 $transformer = new Transformer(ConfiguredSerializer::createWithHandlers([
    new TrimStringValueHandler(),
    new CountryCodeEnumHandler(),
    new CurrencyCodeEnumHandler(),
    new DocumentTypeEnumHandler(),
    new ReferenceQualifierEnumHandler(),
    new UnitCodeEnumHandler(),
    new MimeTypeEnumHandler(),
    new ElectronicAddressSchemeIdentifierEnumHandler(),
]));

This allows to register custom handlers, or even add handlers which the library offers but does not include by default (yet) like the TrimStringValueHandler.

Considerations

Limitations

This library does not offer any way to validate the structured data against the rules of EN16931 or any of the CIUS. Please take a look at the folder Validators in the tests folder. There you will find ways to validate the documents against the CIUS specification rulesets. ZUGFeRD/factur-x offers XSD-Schema-Files which you may use directly in your PHP code. KOSiT offers a dedicated validator to validate your EN16931 document against the XRechnung CIUS specification.

Issues and contribution

Feel free to create Pull-Requests or Issue if you have trouble with this library or any related resource.