Invoices: Allow issuing invoices only to businesses (Z#23220397) (#5807)

* Invoices: Allow issuing invoices only to businesses

In situations where every invoice has a significant accounting cost and
consumers usually do not need invoices, this can save a lot of money or
effort.

* Improve backend UI if not qualified for invoice

src/pretix/base/services/invoices.py

@@ -521,9 +521,20 @@ def invoice_pdf_task(invoice: int):
 
 
 def invoice_qualified(order: Order):
-    if order.total == Decimal('0.00') or order.require_approval or \
-            order.sales_channel.identifier not in order.event.settings.get('invoice_generate_sales_channels'):
+    if order.total == Decimal('0.00'):
         return False
+    if order.require_approval:
+        return False
+    if order.sales_channel.identifier not in order.event.settings.invoice_generate_sales_channels:
+        return False
+    if order.status in (Order.STATUS_CANCELED, Order.STATUS_EXPIRED):
+        return False
+    if order.event.settings.invoice_generate_only_business:
+        try:
+            ia = order.invoice_address
+            return ia.is_business
+        except InvoiceAddress.DoesNotExist:
+            return False
     return True
 
 

src/pretix/base/settings.py

@@ -1225,6 +1225,15 @@ DEFAULTS = {
         'default': json.dumps(['web']),
         'type': list
     },
+    'invoice_generate_only_business': {
+        'default': 'False',
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Only issue invoices to business customers"),
+        )
+    },
     'invoice_address_from': {
         'default': '',
         'type': str,