Writing an invoice transmission plugin

An invoice transmission provider transports an invoice from the sender to the recipient. There are pre-defined types of invoice transmission in pretix, currently "email", "peppol", and "it_sdi". You can find more information about them at Transmission types.

New transmission types can not be added by plugins but need to be added to pretix itself. However, plugins can provide implementations for the actual transmission. Please read Creating a plugin first, if you haven’t already.

Output registration

New invoice transmission providers can be registered through the registry mechanism

1from pretix.base.invoicing.transmission import transmission_providers, TransmissionProvider
2
3@transmission_providers.new()
4class SdiTransmissionProvider(TransmissionProvider):
5    identifier = "fatturapa_providerabc"
6    type = "it_sdi"
7    verbose_name = _("FatturaPA through provider ABC")
8    ...

The provider class

class pretix.base.invoicing.transmission.TransmissionProvider
TransmissionProvider.identifier

A short and unique identifier for this transmission provider. This should only contain lowercase letters and underscores.

This is an abstract attribute, you must override this!

TransmissionProvider.type

Identifier of the transmission type this provider provides.

This is an abstract attribute, you must override this!

TransmissionProvider.verbose_name

A human-readable name for this transmission provider (can be localized).

This is an abstract attribute, you must override this!

TransmissionProvider.priority

Returns a priority that is used for sorting transmission providers. Higher priority will be chosen over lower priority for transmission. Default to 100.

TransmissionProvider.testmode_supported

Whether testmode invoices may be passed to this provider.

TransmissionProvider.is_ready(event) → bool

Return whether this provider has all required configuration to be used in this event.

This is an abstract method, you must override this!

TransmissionProvider.is_available(event, country: Country, is_business: bool) → bool

Return whether this provider may be used for an invoice for the given recipient country and address type.

This is an abstract method, you must override this!

TransmissionProvider.transmit(invoice: Invoice)

Transmit the invoice. The invoice passed as a parameter will be in status TRANSMISSION_STATUS_INFLIGHT. Invoices that stay in this state for more than 24h will be retried automatically. Implementations are expected to:

  • Send the invoice.

  • Update the transmission_status to TRANSMISSION_STATUS_COMPLETED or TRANSMISSION_STATUS_FAILED after sending, as well as transmission_info with provider-specific data, and transmission_date to the date and time of completion.

  • Create a log entry of action type pretix.event.order.invoice.sent or pretix.event.order.invoice.sending_failed with the fields full_invoice_no, transmission_provider, transmission_type and a provider-specific data field.

Make sure to either handle invoice.order.testmode properly or set testmode_supported to False.

This is an abstract method, you must override this!

TransmissionProvider.settings_url(event) → str | None

Return a URL to the settings page of this provider (if any).