PPv2: Handle payment execution/capture calls properly even if no captures are present yet.

src/pretix/plugins/paypal2/payment.py

@@ -786,23 +786,29 @@ class PaypalMethod(BasePaymentProvider):
                 else:
                     pp_captured_order = response.result
 
-                for purchaseunit in pp_captured_order.purchase_units:
-                    for capture in purchaseunit.payments.captures:
-                        try:
-                            ReferencedPayPalObject.objects.get_or_create(order=payment.order, payment=payment, reference=capture.id)
-                        except ReferencedPayPalObject.MultipleObjectsReturned:
-                            pass
-
-                        if capture.status != 'COMPLETED':
-                            messages.warning(request, _('PayPal has not yet approved the payment. We will inform you as '
-                                                        'soon as the payment completed.'))
-                            payment.info = json.dumps(pp_captured_order.dict())
-                            payment.state = OrderPayment.PAYMENT_STATE_PENDING
-                            payment.save()
-                            return
-
             payment.refresh_from_db()
 
+            any_captures = False
+            all_captures_completed = True
+            for purchaseunit in pp_captured_order.purchase_units:
+                for capture in purchaseunit.payments.captures:
+                    try:
+                        ReferencedPayPalObject.objects.get_or_create(order=payment.order, payment=payment, reference=capture.id)
+                    except ReferencedPayPalObject.MultipleObjectsReturned:
+                        pass
+
+                    if capture.status != 'COMPLETED':
+                        all_captures_completed = False
+                    else:
+                        any_captures = True
+            if not (any_captures and all_captures_completed):
+                messages.warning(request, _('PayPal has not yet approved the payment. We will inform you as '
+                                            'soon as the payment completed.'))
+                payment.info = json.dumps(pp_captured_order.dict())
+                payment.state = OrderPayment.PAYMENT_STATE_PENDING
+                payment.save()
+                return
+
             if pp_captured_order.status != 'COMPLETED':
                 payment.fail(info=pp_captured_order.dict())
                 logger.error('Invalid state: %s' % repr(pp_captured_order.dict()))