Allow payment providers to define custom form fields / templates

src/pretix/presale/templates/pretixpresale/event/checkout_payment.html

@@ -23,6 +23,7 @@
                     </div>
                     <div id="payment_{{ p.provider.identifier }}" class="panel-collapse collapse">
                         <div class="panel-body form-horizontal">
+                            {{ p.form }}
                         </div>
                     </div>
                 </div>

src/pretix/presale/templates/pretixpresale/event/checkout_payment_form_default.html

@@ -0,0 +1,2 @@
+{% load bootstrap3 %}
+{% bootstrap_form form layout='horizontal' %}

src/pretix/presale/views/checkout.py

@@ -218,6 +218,7 @@ class PaymentDetails(EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin,
             providers.append({
                 'provider': provider,
                 'fee': fee,
+                'form': provider.checkout_form_render(self.request),
             })
         return providers