Show successful payments on the invoice

src/pretix/api/serializers/event.py

@@ -530,6 +530,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'invoice_address_beneficiary',
         'invoice_name_required',
         'invoice_address_not_asked_free',
+        'invoice_show_payments',
         'invoice_include_free',
         'invoice_generate',
         'invoice_numbers_consecutive',

src/pretix/base/invoice.py

@@ -28,7 +28,7 @@ from reportlab.platypus import (
 )
 
 from pretix.base.decimal import round_decimal
-from pretix.base.models import Event, Invoice
+from pretix.base.models import Event, Invoice, Order
 from pretix.base.signals import register_invoice_renderers
 from pretix.base.templatetags.money import money_filter
 
@@ -559,6 +559,20 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
             ])
             colwidths = [a * doc.width for a in (.65, .05, .30)]
 
+        if self.invoice.event.settings.invoice_show_payments and not self.invoice.is_cancellation and \
+                self.invoice.order.status == Order.STATUS_PENDING:
+            pending_sum = self.invoice.order.pending_sum
+            if pending_sum != total:
+                tdata.append([pgettext('invoice', 'Received payments')] + (['', '', ''] if has_taxes else ['']) + [
+                    money_filter(pending_sum - total, self.invoice.event.currency)
+                ])
+                tdata.append([pgettext('invoice', 'Outstanding payments')] + (['', '', ''] if has_taxes else ['']) + [
+                    money_filter(pending_sum, self.invoice.event.currency)
+                ])
+                tstyledata += [
+                    ('FONTNAME', (0, len(tdata) - 3), (-1, len(tdata) - 3), self.font_bold),
+                ]
+
         table = Table(tdata, colWidths=colwidths, repeatRows=1)
         table.setStyle(TableStyle(tstyledata))
         story.append(table)

src/pretix/base/settings.py

@@ -205,6 +205,17 @@ DEFAULTS = {
             help_text=_("This text will be shown above the invoice address form during checkout.")
         )
     },
+    'invoice_show_payments': {
+        'default': 'True',
+        'type': bool,
+        'form_class': forms.BooleanField,
+        'serializer_class': serializers.BooleanField,
+        'form_kwargs': dict(
+            label=_("Show paid amount on partially paid invoices"),
+            help_text=_("If an invoice has already been paid partially, this option will add the paid and pending "
+                        "amount to the invoice."),
+        )
+    },
     'invoice_include_free': {
         'default': 'True',
         'type': bool,

src/pretix/control/forms/event.py

@@ -570,6 +570,7 @@ class InvoiceSettingsForm(SettingsForm):
         'invoice_name_required',
         'invoice_address_not_asked_free',
         'invoice_include_free',
+        'invoice_show_payments',
         'invoice_generate',
         'invoice_attendee_name',
         'invoice_include_expire_date',

src/pretix/control/templates/pretixcontrol/event/invoicing.html

@@ -14,6 +14,7 @@
                 {% bootstrap_field form.invoice_email_attachment layout="control" %}
                 {% bootstrap_field form.invoice_language layout="control" %}
                 {% bootstrap_field form.invoice_include_free layout="control" %}
+                {% bootstrap_field form.invoice_show_payments layout="control" %}
                 {% bootstrap_field form.invoice_numbers_consecutive layout="control" %}
                 {% bootstrap_field form.invoice_numbers_prefix layout="control" %}
                 {% bootstrap_field form.invoice_numbers_prefix_cancellations layout="control" %}