Include amount in refund email

app/mailers/payment_mailer.rb

@@ -24,6 +24,7 @@ class PaymentMailer < ApplicationMailer
   def refund_available(payment, taler_order_status_url)
     @order = payment.order
     @shop = @order.distributor.name
+    @amount = payment.display_amount
     @taler_order_status_url = taler_order_status_url
 
     I18n.with_locale valid_locale(@order.user) do

app/views/payment_mailer/refund_available.html.haml

@@ -1,2 +1,2 @@
-%p= t(".message", shop: @shop)
+%p= t(".message", shop: @shop, amount: @amount)
 %p= link_to @taler_order_status_url, @taler_order_status_url

config/locales/en.yml

@@ -468,7 +468,7 @@ en:
     refund_available:
       subject: "Refund from %{shop}"
       message: |
-        Your payment to %{shop} is being refunded.
+        Your payment of %{amount} to %{shop} is being refunded.
         Accept your refund following the link below.
   producer_mailer:
     order_cycle:

spec/mailers/payment_mailer_spec.rb

@@ -49,8 +49,8 @@ RSpec.describe PaymentMailer do
       mail = PaymentMailer.refund_available(payment, link)
 
       expect(mail.subject).to eq "Refund from Carrot Castle"
-      expect(mail.body).to match "Your payment to Carrot Castle is being refunded."
-      expect(mail.body).to match link
+      expect(mail.body).to include "Your payment of $45.75 to Carrot Castle is being refunded."
+      expect(mail.body).to include link
     end
   end
 end