Move helper to service for re-use

app/services/order_payment_finder.rb

@@ -1,5 +1,7 @@
-module OrdersHelper
-  def order_paid_via(order)
+# frozen_string_literal: true
+
+module OrderPaymentFinder
+  def self.last_payment_method(order)
     # `sort_by` avoids additional database queries when payments are loaded
     # already. There is usually only one payment and this shouldn't cause
     # any overhead compared to `order(:updated_at)`.

app/views/spree/shared/_order_details.html.haml

@@ -13,9 +13,9 @@
     .pad
       .text-big
         = t :order_payment
-        %strong=  order_paid_via(order).andand.name
+        %strong=  OrderPaymentFinder.last_payment_method(order).andand.name
       %p.text-small.text-skinny.pre-line
-        %em= order_paid_via(order).andand.description
+        %em= OrderPaymentFinder.last_payment_method(order).andand.description
 
     .order-summary.text-small
       %strong