Pluggable invoice transmission methods (#5020)

* Flexible invoice transmission

* UI work

* Add peppol and output

* API support

* Profile integration

* Simplify form for individuals

* Remove sent_to_customer usage

* more steps

* Revert "Bank transfer: Allow to send the invoice direclty to the accounting department (#2975)"

This reverts commit cea6c340be.

* minor fixes

* Fixes after rebase

* update stati

* Backend view

* Transmit and show status

* status, retransmission

* API retransmission

* More fields

* API docs

* Plugin docs

* Update migration

* Add missing license headers

* Remove dead code, fix current tests

* Run isort

* Update regex

* Rebase migration

* Fix migration

* Add tests, fix bugs

* Rebase migration

* Apply suggestion from @luelista

Co-authored-by: luelista <weller@rami.io>

* Apply suggestion from @luelista

Co-authored-by: luelista <weller@rami.io>

* Apply suggestion from @luelista

Co-authored-by: luelista <weller@rami.io>

* Apply suggestion from @luelista

Co-authored-by: luelista <weller@rami.io>

* Apply suggestion from @luelista

Co-authored-by: luelista <weller@rami.io>

* Make migration reversible

* Add TransmissionType.enforce_transmission

* Fix registries API usage after rebase

* Remove code I forgot to delete

* Update transmission status display depending on type

* Add testmode_supported

* Update src/pretix/static/pretixbase/js/addressform.js

Co-authored-by: luelista <weller@rami.io>

* Update src/pretix/static/pretixbase/js/addressform.js

Co-authored-by: luelista <weller@rami.io>

* Update src/pretix/static/pretixbase/js/addressform.js

Co-authored-by: luelista <weller@rami.io>

* New mechanism for non-required invoice forms

* Update src/pretix/base/invoicing/transmission.py

Co-authored-by: luelista <weller@rami.io>

* Declare testmode_supported for email

* Make transmission_email_other an implementation detail

* Fix failing tests and add new ones

* Update src/pretix/base/services/invoices.py

Co-authored-by: luelista <weller@rami.io>

* Add emails to email history

* Fix comma error

* More generic default email text

* Cleanup

* Remove "email invoices" button and refine logic

* Rebase migration

* Fix edge case

---------

Co-authored-by: luelista <weller@rami.io>

src/tests/api/test_invoices.py

@@ -28,7 +28,7 @@ import pytest
 from django_countries.fields import Country
 from django_scopes import scopes_disabled
 
-from pretix.base.models import InvoiceAddress, Order, OrderPosition
+from pretix.base.models import Invoice, InvoiceAddress, Order, OrderPosition
 from pretix.base.models.orders import OrderFee
 from pretix.base.services.invoices import (
     generate_cancellation, generate_invoice,
@@ -201,6 +201,7 @@ TEST_INVOICE_RES = {
     "invoice_from_tax_id": "",
     "invoice_from_vat_id": "",
     "invoice_to": "Sample company\nNew Zealand\nVAT-ID: DE123",
+    "invoice_to_is_business": False,
     "invoice_to_company": "Sample company",
     "invoice_to_name": "",
     "invoice_to_street": "",
@@ -210,6 +211,7 @@ TEST_INVOICE_RES = {
     "invoice_to_country": "NZ",
     "invoice_to_vat_id": "DE123",
     "invoice_to_beneficiary": "",
+    "invoice_to_transmission_info": {},
     "custom_field": None,
     "date": "2017-12-10",
     "refers": None,
@@ -260,7 +262,11 @@ TEST_INVOICE_RES = {
             "tax_name": "",
             "tax_rate": "19.00"
         }
-    ]
+    ],
+    "transmission_type": "email",
+    "transmission_provider": None,
+    "transmission_status": "pending",
+    "transmission_date": None
 }
 
 
@@ -366,6 +372,26 @@ def test_invoice_detail(token_client, organizer, event, item, invoice):
     assert res == resp.data
 
 
+@pytest.mark.django_db
+def test_invoice_retransmit(token_client, organizer, event, invoice):
+    invoice.transmission_status = Invoice.TRANSMISSION_STATUS_INFLIGHT
+    invoice.save()
+    resp = token_client.post('/api/v1/organizers/{}/events/{}/invoices/{}/retransmit/'.format(
+        organizer.slug, event.slug, invoice.number
+    ))
+    assert resp.status_code == 409
+
+    invoice.transmission_status = Invoice.TRANSMISSION_STATUS_FAILED
+    invoice.save()
+    resp = token_client.post('/api/v1/organizers/{}/events/{}/invoices/{}/retransmit/'.format(
+        organizer.slug, event.slug, invoice.number
+    ))
+    assert resp.status_code == 204
+
+    invoice.refresh_from_db()
+    assert invoice.transmission_status == Invoice.TRANSMISSION_STATUS_PENDING
+
+
 @pytest.mark.django_db
 def test_invoice_regenerate(token_client, organizer, event, invoice):
     organizer.settings.invoice_regenerate_allowed = True