szamlazz.py

The szamlazz.py package is a Python client (wrapper) for Szamlazz.hu::Számla Agent.

Introduction

Számla Agent is a non-browser-based interface of the Számlázz.hu system. It receives XML messages and depending on the received information it can do various actions.

Using szamlazz.py, you can interact with this interface in a convenient and Pythonic way.

szamlazz.py provides multiple translated (Hungarian -> English) NamedTuple classes to help interaction with the API client.

Integration

Install the package from PyPI:

pip install szamlazz.py

Import the client into your Python module:

from szamlazz import SzamlazzClient

# Depending on your future action(s), you might need the following model classes too:
from szamlazz import Header, Merchant, Buyer, Item, PdfDataMissingError

For all model classes, see models.py.

API

The SzamlazzClient instance can be initialised in two ways:

• username/password combination
• Agent Key (Számla Agent Kulcs)

Failing to provide one of these authentication methods will raise AssertionError.

All actions (e.g.: generate_invoice, reverse_invoice, etc.) return a new SzamlazzResponse instance.
SzamlazzResponse has the following major parameters:

• .has_errors
• .error_code
• .error_message
• .ok
• .response
• .text

SzamlazzResponse has the following major functions:

• .get_pdf_base64()
• .get_pdf_bytes()
• .write_pdf_to_disk()
• .print_errors()

For more details, see the contents of class SzamlazzResponse.

Implementation Status

Currently, the following actions can be executed via szamlazz.py:

• create invoices
• reverse invoices
• register credit entries
• query invoice pdf files
• query invoice xml files
• delete pro forma invoices
• create receipts // With limitations. See the source code for more details
• reverse receipts
• query receipts
• send receipts
• query taxpayers
• self billing // Implementation is not on the roadmap

Note: New actions are continuously implemented. Contributions are welcome too.

Each action's function takes a definite number of arguments. For example, let's examine SzamlazzClient.generate_invoice():

from typing import List
from szamlazz.models import Header, Merchant, Buyer, Item, SzamlazzResponse

def generate_invoice(header: Header,
                     merchant: Merchant,
                     buyer: Buyer,
                     items: List[Item],
                     e_invoice: bool = True,
                     invoice_download: bool = True,
                     ) -> SzamlazzResponse:
    pass

The Szamlazz.hu::Számla Agent XML has the following tags (depending on the action):

<xmlszamla>
    <beallitasok></beallitasok>
    <fejlec></fejlec>
    <elado></elado>
    <vevo></vevo>
    <tetelek>
        <tetel></tetel>
    </tetelek>
</xmlszamla>

Each of these tags, except <beallitasok> and <tetelek> can be mapped to a dataclass model:

• fejlec -> Header
• elado -> Merchant
• vevo -> Buyer
• tetel -> Item

Use the models to create your payloads for each action, for example, to create a <fejlec>:

from szamlazz.models import Header

fejlec = Header(
    creating_date="2021-08-26",
    payment_date="2021-08-26",
    due_date="2021-08-31",
    payment_type="Átutalás",
    currency="HUF",
    invoice_language="hu",
    invoice_comment="No Comment",
    name_of_bank="MNB",
    exchange_rate=0.0,
    order_number="ORDER-73",
    pro_forma_number_ref="",
    deposit_invoice=False,
    invoice_after_deposit_invoice=False,
    correction_invoice=False,
    number_of_corrected_invoice="",
    proforma_invoice=False,
    invoice_prefix="DK",
)

This Header dataclass instance can be passed to the generate_invoice function:

resp = generate_invoice(header=fejlec)

Contribution

Contributions are welcome. Should you have a question or an idea, open a new GitHub issue. Your contributions are expected through GitHub Pull Requests.

If you're developing with PyCharm, consider using examples/IntelliJ Config Template.run.xml to configure the examples (demo files) for quick testing.

Releasing

Releases are automatically pushed from the master branch on a new tag using GitHub Workflows.

Manual Releasing
Make sure you have the latest version of PyPA’s build installed:

python -m pip install --upgrade build

Run this command from the same directory where pyproject.toml is located:

python setup.py sdist bdist_wheel

License

MIT