Add basic invoices setup

lib/strike_me/api/invoices.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module StrikeMe
+  module API
+    # Factory helper object connecting the client to the models
+    class Invoices
+      include BaseClient
+      include Enumerable
+
+      autoload_default :Invoice
+
+      delegate :first, :last, :size, :any?, to: :list
+
+      def each(&block)
+        list.each(&block)
+      end
+
+      def list
+        return @list if @list.present?
+
+        url = 'invoices'
+        response = client.get url
+
+        raise ResponseError.new(url, response.body) unless response.success?
+
+        @list = response.body['items'].map { |item| Invoice.new item }
+      end
+    end
+  end
+end