Add Invoice.fee_type, Invoice.fee_internal_type

src/pretix/api/serializers/order.py

@@ -1425,7 +1425,8 @@ class InlineInvoiceLineSerializer(I18nAwareModelSerializer):
     class Meta:
         model = InvoiceLine
         fields = ('position', 'description', 'item', 'variation', 'attendee_name', 'event_date_from',
-                  'event_date_to', 'gross_value', 'tax_value', 'tax_rate', 'tax_name')
+                  'event_date_to', 'gross_value', 'tax_value', 'tax_rate', 'tax_name', 'fee_type',
+                  'fee_internal_type')
 
 
 class InvoiceSerializer(I18nAwareModelSerializer):

src/pretix/base/migrations/0195_auto_20210622_1457.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.3 on 2021-06-22 14:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0194_membership_canceled'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoiceline',
+            name='fee_internal_type',
+            field=models.CharField(max_length=190, null=True),
+        ),
+        migrations.AddField(
+            model_name='invoiceline',
+            name='fee_type',
+            field=models.CharField(max_length=190, null=True),
+        ),
+    ]

src/pretix/base/models/invoices.py

@@ -343,6 +343,8 @@ class InvoiceLine(models.Model):
     item = models.ForeignKey('Item', null=True, blank=True, on_delete=models.PROTECT)
     variation = models.ForeignKey('ItemVariation', null=True, blank=True, on_delete=models.PROTECT)
     attendee_name = models.TextField(null=True, blank=True)
+    fee_type = models.CharField(max_length=190, null=True, blank=True)
+    fee_internal_type = models.CharField(max_length=190, null=True, blank=True)
 
     @property
     def net_value(self):

src/pretix/base/services/invoices.py

@@ -244,7 +244,9 @@ def build_invoice(invoice: Invoice) -> Invoice:
                 event_date_to=None if invoice.event.has_subevents else invoice.event.date_to,
                 tax_value=fee.tax_value,
                 tax_rate=fee.tax_rate,
-                tax_name=fee.tax_rule.name if fee.tax_rule else ''
+                tax_name=fee.tax_rule.name if fee.tax_rule else '',
+                fee_type=fee.fee_type,
+                fee_internal_type=fee.internal_type or None,
             )
 
             if fee.tax_rule and fee.tax_rule.is_reverse_charge(ia) and fee.value and not fee.tax_value: