From 988340400d4101050a1eaa3adaa42b39baed5e54 Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Mon, 19 Sep 2016 18:06:07 +0200
Subject: [PATCH] Only show "change payment method" if another one is available

---
 .../templates/pretixpresale/event/order.html       | 14 ++++++++------
 src/pretix/presale/views/order.py                  | 10 ++++++++++
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/src/pretix/presale/templates/pretixpresale/event/order.html b/src/pretix/presale/templates/pretixpresale/event/order.html
index c0fed6e2cb..abef98d3dd 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order.html
@@ -33,12 +33,14 @@
     {% if order.status == "n" %}
         <div class="panel panel-danger">
             <div class="panel-heading">
-                <div class="pull-right">
-                    <a href="{% eventurl event "presale:event.order.pay.change" secret=order.secret order=order.code %}">
-                        <span class="fa fa-edit"></span>
-                        {% trans "Use different payment method" %}
-                    </a>
-                </div>
+                {% if can_change_method %}
+                    <div class="pull-right">
+                        <a href="{% eventurl event "presale:event.order.pay.change" secret=order.secret order=order.code %}">
+                            <span class="fa fa-edit"></span>
+                            {% trans "Use different payment method" %}
+                        </a>
+                    </div>
+                {% endif %}
                 <h3 class="panel-title">
                     {% trans "Payment" %}
                 </h3>
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index a59ca0360c..ec558343cc 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -113,6 +113,16 @@ class OrderDetails(EventViewMixin, OrderDetailMixin, CartMixin, TemplateView):
                 and self.payment_provider.is_enabled
                 and self.order._can_be_paid()
             )
+
+            ctx['can_change_method'] = False
+            responses = register_payment_providers.send(self.request.event)
+            for receiver, response in responses:
+                provider = response(self.request.event)
+                if (provider.identifier != self.order.payment_provider and provider.is_enabled
+                        and provider.order_change_allowed(self.order)):
+                    ctx['can_change_method'] = True
+                    break
+
         elif self.order.status == Order.STATUS_PAID:
             ctx['payment'] = self.payment_provider.order_paid_render(self.request, self.order)
             ctx['can_retry'] = False