feat(unit-price) add amount_details attribute to Fee object

app/graphql/types/fees/amount_details/graduated_percentage_range.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Types
+  module Fees
+    module AmountDetails
+      class GraduatedPercentageRange < Types::BaseObject
+        graphql_name 'FeeAmountDetailsGraduatedPercentageRange'
+
+        field :units, String, null: true
+        field :from_value, Integer, null: true
+        field :to_value, Integer, null: true
+        field :flat_unit_amount, String, null: true
+        field :rate, String, null: true
+        field :per_unit_total_amount, String, null: true
+        field :total_with_flat_amount, String, null: true
+      end
+    end
+  end
+end

app/graphql/types/fees/amount_details/graduated_range.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Types
+  module Fees
+    module AmountDetails
+      class GraduatedRange < Types::BaseObject
+        graphql_name 'FeeAmountDetailsGraduatedRange'
+
+        field :units, String, null: true
+        field :from_value, Integer, null: true
+        field :to_value, Integer, null: true
+        field :flat_unit_amount, String, null: true
+        field :per_unit_amount, String, null: true
+        field :per_unit_total_amount, String, null: true
+        field :total_with_flat_amount, String, null: true
+      end
+    end
+  end
+end

app/graphql/types/fees/amount_details/object.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Types
+  module Fees
+    module AmountDetails
+      class Object < Types::BaseObject
+        graphql_name 'FeeAmountDetails'
+
+        # NOTE: Graduated charge model
+        field :graduated_ranges, [Types::Fees::AmountDetails::GraduatedRange], null: true
+
+        # NOTE: Graduated percentage modle
+        field :graduated_percentage_ranges, [Types::Fees::AmountDetails::GraduatedPercentageRange], null: true
+
+        # NOTE: Package charge model
+        field :free_units, String, null: true
+        field :paid_units, String, null: true
+        field :per_package_size, Integer, null: true
+        field :per_package_unit_amount, String, null: true
+
+        # NOTE: Percentage charge model
+        field :units, String, null: true
+        field :free_events, Integer, null: true
+        field :rate, String, null: true
+        field :per_unit_total_amount, String, null: true
+        field :paid_events, Integer, null: true
+        field :fixed_fee_unit_amount, String, null: true
+        field :fixed_fee_total_amount, String, null: true
+        field :min_max_adjustment_total_amount, String, null: true
+
+        # NOTE: Volume charge model
+        field :volume_ranges, [Types::Fees::AmountDetails::VolumeRange], null: true
+      end
+    end
+  end
+end

app/graphql/types/fees/amount_details/volume_range.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Types
+  module Fees
+    module AmountDetails
+      class VolumeRange < Types::BaseObject
+        graphql_name 'FeeAmountDetailsVolumeRange'
+
+        field :per_unit_amount, String, null: false
+        field :flat_unit_amount, String, null: false
+        field :per_unit_total_amount, String, null: false
+      end
+    end
+  end
+end

app/graphql/types/fees/object.rb

@@ -26,6 +26,8 @@ class Object < Types::BaseObject
 
       field :applied_taxes, [Types::Fees::AppliedTaxes::Object]
 
+      field :amount_details, Types::Fees::AmountDetails::Object, null: true
+
       delegate :group_name, to: :object
       delegate :invoice_name, to: :object