Add option to exclude Sales Channels from invoice generation

src/pretix/base/services/invoices.py

@@ -257,7 +257,8 @@ def invoice_pdf_task(invoice: int):
 
 
 def invoice_qualified(order: Order):
-    if order.total == Decimal('0.00') or order.require_approval:
+    if order.total == Decimal('0.00') or order.require_approval or \
+            order.sales_channel not in order.event.settings.get('invoice_generate_sales_channels'):
         return False
     return True
 

src/pretix/base/settings.py

@@ -145,6 +145,10 @@ DEFAULTS = {
         'default': 'False',
         'type': str
     },
+    'invoice_generate_sales_channels': {
+        'default': json.dumps(['web']),
+        'type': list
+    },
     'invoice_address_from': {
         'default': '',
         'type': str