diff --git a/src/pretix/base/payment.py b/src/pretix/base/payment.py
index b66a60c71..e6d9129df 100644
--- a/src/pretix/base/payment.py
+++ b/src/pretix/base/payment.py
@@ -105,7 +105,7 @@ class BasePaymentProvider:
         """
         raise NotImplementedError()  # NOQA
 
-    def checkout_prepare(self, request, total) -> "bool|HttpResponse":
+    def checkout_prepare(self, request, cart) -> "bool|HttpResponse":
         """
         Will be called if the user selects this provider as his payment method.
         If the payment provider provides a form to the user to enter payment data,
@@ -117,8 +117,6 @@ class BasePaymentProvider:
 
         On errors, it should use Django's message framework to display an error message
         to the user (or the normal form validation error messages).
-
-        :param total: The total price of the order, including the payment method fee.
         """
         form = self.checkout_form(request)
         if form.is_valid():
diff --git a/src/pretix/presale/views/checkout.py b/src/pretix/presale/views/checkout.py
index a25d232d3..3cdadac2e 100644
--- a/src/pretix/presale/views/checkout.py
+++ b/src/pretix/presale/views/checkout.py
@@ -205,7 +205,7 @@ class CheckoutStart(EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin,
         return ctx
 
 
-class PaymentDetails(EventViewMixin, EventLoginRequiredMixin, CheckoutView):
+class PaymentDetails(EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin, CheckoutView):
     template_name = "pretixpresale/event/checkout_payment.html"
 
     @cached_property
@@ -234,10 +234,10 @@ class PaymentDetails(EventViewMixin, EventLoginRequiredMixin, CheckoutView):
         for p in self.provider_forms:
             if p['provider'].identifier == request.POST.get('payment', ''):
                 request.session['payment'] = p['provider'].identifier
-                total = self._total_order_value + p['provider'].calculate_fee(self._total_order_value)
-                resp = p['provider'].checkout_prepare(request, total)
+                resp = p['provider'].checkout_prepare(
+                    request, self.get_cart(payment_fee=p['provider'].calculate_fee(self._total_order_value)))
                 if isinstance(resp, str):
-                    return redirect(str)
+                    return redirect(resp)
                 elif resp is True:
                     return redirect(self.get_confirm_url())
                 else: