Thanks for taking your time to contribute to this project! This document will get you on the right track to help improve eInvoicing.
Use the following sites to get more information about the European electronic invocing specification:
- EU e-Invoicing core concepts
- Compliance with the European standard on eInvoicing
- Obtaining a copy of the European standard on eInvoicing
- UBL Invoice fields
- CEF eInvoicing Validator
Before opening a Pull Request, please make sure your code meets the following requirements:
The main repository branch is only for stable releases.
vendor/bin/phan --testdox
vendor/bin/simple-phpunit
Although the most popular European Invoicing CIUS is PEPPOL BIS Billing 3.0, the real deal is the "European Standard for Electronic invocing" or EN 16931.
This means that, while most users will use the Peppol preset for reading and writing invoices, there are other CIUS/extensions from various member states and business sectors which might not be an exact match to PEPPOL.
Because the one thing all these specifications have in common is EN 16931, fields and methods you add to the library must have the same names as they do in the European Standard.