Add fees name for a variant to its serializer

app/models/spree/variant.rb

@@ -172,6 +172,11 @@ module Spree
       OpenFoodNetwork::EnterpriseFeeCalculator.new(distributor, order_cycle).fees_by_type_for self
     end
 
+    def fees_name_by_type_for(distributor, order_cycle)
+      OpenFoodNetwork::EnterpriseFeeCalculator.new(distributor,
+                                                   order_cycle).fees_name_by_type_for self
+    end
+
     def option_value(opt_name)
       option_values.detect { |o| o.option_type.name == opt_name }.try(:presentation)
     end

app/serializers/api/variant_serializer.rb

@@ -4,7 +4,8 @@ class Api::VariantSerializer < ActiveModel::Serializer
   attributes :id, :is_master, :product_name, :sku,
              :options_text, :unit_value, :unit_description, :unit_to_display,
              :display_as, :display_name, :name_to_display,
-             :price, :on_demand, :on_hand, :fees, :price_with_fees,
+             :price, :on_demand, :on_hand,
+             :fees, :fees_name, :price_with_fees,
              :tag_list, :thumb_url,
              :unit_price_price, :unit_price_unit
 
@@ -15,6 +16,10 @@ class Api::VariantSerializer < ActiveModel::Serializer
       object.fees_by_type_for(options[:current_distributor], options[:current_order_cycle])
   end
 
+  def fees_name
+    object.fees_name_by_type_for(options[:current_distributor], options[:current_order_cycle])
+  end
+
   def price_with_fees
     if options[:enterprise_fee_calculator]
       object.price + options[:enterprise_fee_calculator].indexed_fees_for(object)

spec/serializers/api/variant_serializer_spec.rb

@@ -20,6 +20,7 @@ describe Api::VariantSerializer do
         :on_demand,
         :price,
         :fees,
+        :fees_name,
         :price_with_fees,
         :product_name,
         :tag_list # Used to apply tag rules