Payments#index - use prebuilt action

app/helpers/spree/admin/navigation_helper.rb

@@ -361,6 +361,10 @@ def store_credits_actions
       def adjustments_actions
         Rails.application.config.spree_backend.actions[:adjustments]
       end
+
+      def payments_actions
+        Rails.application.config.spree_backend.actions[:payments]
+      end
       # rubocop:enable Metrics/ModuleLength
     end
   end

app/models/spree/admin/actions/payments_default_actions_builder.rb

@@ -0,0 +1,40 @@
+module Spree
+  module Admin
+    module Actions
+      class PaymentsDefaultActionsBuilder
+        include Spree::Core::Engine.routes.url_helpers
+
+        def build
+          root = Root.new
+          add_new_payment_action(root)
+          root
+        end
+
+        private
+
+        def add_new_payment_action(root)
+          action =
+            ActionBuilder.new(new_payment_config).
+            with_availability_check(
+              lambda do |ability, resource|
+                ability.can?(:create, ::Spree::Payment) && resource.outstanding_balance?
+              end
+            ).
+            build
+
+          root.add(action)
+        end
+
+        def new_payment_config
+          {
+            icon_name: 'add.svg',
+            key: :new_payment,
+            url: ->(resource) { new_admin_order_payment_path(resource) },
+            classes: 'btn-success',
+            id: 'new_payment_section'
+          }
+        end
+      end
+    end
+  end
+end

app/views/spree/admin/payments/index.html.erb

@@ -1,10 +1,15 @@
 <%= render partial: 'spree/admin/shared/order_tabs', locals: { current: :payments } %>
 
 <% content_for :page_actions do %>
-  <% if @order.outstanding_balance? && can?(:create, Spree::Payment) %>
-    <span id="new_payment_section">
-      <%= button_link_to Spree.t(:new_payment), new_admin_order_payment_url(@order), class: "btn-success", icon: 'add.svg' %>
-    </span>
+  <% payments_actions.items.each do |action| %>
+    <% next unless action.available?(current_ability, @order) %>
+    <%= button_link_to(
+      action.text,
+      action.url(@order),
+      class: action.classes,
+      icon: action.icon_name,
+      id: action.id
+    ) %>
   <% end %>
 <% end %>
 

lib/spree/backend/engine.rb

@@ -40,6 +40,7 @@ class Engine < ::Rails::Engine
         Rails.application.config.spree_backend.actions.include?(:images) ? (Rails.application.config.spree_backend.actions[:images].items << Spree::Admin::Actions::ImagesDefaultActionsBuilder.new.build.items).flatten! : Rails.application.config.spree_backend.actions[:images] = Spree::Admin::Actions::ImagesDefaultActionsBuilder.new.build
         Rails.application.config.spree_backend.actions[:store_credits] = Spree::Admin::Actions::StoreCreditsDefaultActionsBuilder.new.build
         Rails.application.config.spree_backend.actions[:adjustments] = Spree::Admin::Actions::AdjustmentsDefaultActionsBuilder.new.build
+        Rails.application.config.spree_backend.actions[:payments] = Spree::Admin::Actions::PaymentsDefaultActionsBuilder.new.build
       end
     end
   end

spec/models/spree/admin/actions/payments_default_actions_builder_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+module Spree
+  module Admin
+    describe Actions::PaymentsDefaultActionsBuilder, type: :model do
+      let(:builder) { described_class.new }
+      let(:default_actions) do
+        [:new_payment]
+      end
+
+      describe '#build' do
+        subject { builder.build }
+
+        it 'builds default tabs' do
+          expect(subject.items.map(&:key)).to match(default_actions)
+        end
+      end
+    end
+  end
+end