Divide using float so we don't floor the result and lose the cents in the refund amount.

Author: Simon Fry

app/models/spree/adyen/notification_processor.rb

@@ -77,7 +77,7 @@ def handle_modification_event
 
         elsif notification.refund?
           payment.refunds.create!(
-            amount: notification.value / 100, # cents to dollars
+            amount: notification.value / 100.0, # cents to dollars
             transaction_id: notification.psp_reference,
             refund_reason_id: ::Spree::RefundReason.first.id # FIXME
           )

spec/models/spree/adyen/notification_processor_spec.rb

@@ -200,6 +200,11 @@
             from(0).
             to(1)
         end
+
+        it "creates a refund of the correct value" do
+          subject
+          expect(payment.reload.refunds.last.amount).to eq 23.99
+        end
       end
 
       context "when refunded from Solidus" do