fix: show payment method surcharges

apps/checkout/applicator.py

@@ -0,0 +1,31 @@
+from decimal import Decimal as D
+
+from oscar.apps.checkout import applicator
+
+from apps.checkout.surcharges import FlatCharge
+
+
+class SurchargeApplicator(applicator.SurchargeApplicator):
+    def __init__(self, request=None, context=None):
+        super().__init__(request=request, context=context)
+
+    def get_payment_method(self):
+        return self.request.POST.get('payment_method')
+
+    def get_surcharges(self, basket, **kwargs):
+        from apps.payment.models import PaymentMethod
+
+        try:
+            payment_method = PaymentMethod.objects.get(pk=self.get_payment_method())
+        except PaymentMethod.DoesNotExist:
+            return ()
+        if not payment_method or payment_method.charges <= 0:
+            return ()
+        return (
+            FlatCharge(
+                name=payment_method.title,
+                code=payment_method.payment_gateway.slug,
+                excl_tax=D(payment_method.charges * payment_method.currency_factory),
+                incl_tax=D(payment_method.charges * payment_method.currency_factory)
+            ),
+        )

apps/checkout/apps.py

@@ -1,10 +1,13 @@
 import oscar.apps.checkout.apps as apps
 from oscar.core.loading import get_class
 
+from apps.checkout.applicator import SurchargeApplicator
+
 
 class CheckoutConfig(apps.CheckoutConfig):
     name = 'apps.checkout'
+    surcharge_applicator_class = SurchargeApplicator
 
     def ready(self):
-        super(CheckoutConfig,self).ready()
+        super(CheckoutConfig, self).ready()
         self.payment_details_view = get_class('checkout.views', 'PaymentDetailsView')

apps/checkout/surcharges.py

@@ -0,0 +1,8 @@
+from oscar.apps.checkout.surcharges import FlatCharge
+
+
+class FlatCharge(FlatCharge):
+    def __init__(self, name, code, excl_tax=None, incl_tax=None):
+        super().__init__(excl_tax=excl_tax, incl_tax=incl_tax)
+        self.name = name
+        self.code = code

apps/checkout/views.py

@@ -8,6 +8,7 @@
 from django_tenants.utils import get_model
 from oscar.core.loading import get_class
 
+from apps.checkout.applicator import SurchargeApplicator
 from apps.payment.models import PaymentMethod
 
 BillingAddress = get_model("order", "BillingAddress")
@@ -43,7 +44,6 @@ def handle_payment(self, order_number, total, **kwargs):
             currency=total.currency,
             amount_allocated=total.incl_tax,
             amount_debited=total.incl_tax
-
         )
 
         self.add_payment_source(source)
@@ -63,8 +63,10 @@ def render_preview(self, request, **kwargs):
         paypal_object_str = self.is_paypal_payment(request)
         try:
             payment_method_object = PaymentMethod.objects.get(pk=payment_method)
+            basket_surcharges = SurchargeApplicator(request=request).get_surcharges(basket=request.basket)
+
             kwargs.update(dict(payment_method=payment_method_object, stripe_token=stripe_token,
-                               paypal_object_str=paypal_object_str))
+                               paypal_object_str=paypal_object_str, basket_surcharges=basket_surcharges))
         except ValueError as e:
             messages.error(
                 self.request,

templates/eggs/templates/oscar/checkout/partials/order_summery.html

@@ -67,6 +67,12 @@ <h6 class="widget-product-title">
                     {% endif %}
                 </span>
             </li>
+            {% for surcharge in basket_surcharges %}
+                <li class="d-flex justify-content-between align-items-center">
+                    <span class="mr-2">{{ surcharge.name }}:</span>
+                    <span class="text-right">{{ surcharge.excl_tax|currency:basket.currency }}</span>
+                </li>
+            {% endfor %}
             <li class="d-flex justify-content-between align-items-center">
                 <span class="mr-2">Taxes:</span>
                 <span class="text-right">{{ basket.total_tax|currency:basket.currency }}</span>