diff --git a/spec/ups/builders/rate_builder_spec.rb b/spec/ups/builders/rate_builder_spec.rb
index 1c1bb29..e8be5c1 100644
--- a/spec/ups/builders/rate_builder_spec.rb
+++ b/spec/ups/builders/rate_builder_spec.rb
@@ -9,6 +9,7 @@ def setup
       builder.add_ship_to ship_to
       builder.add_ship_from shipper
       builder.add_package package
+      builder.add_return_service '10'
       builder.add_shipment_delivery_confirmation '2'
       builder.add_shipment_direct_delivery_only
     end
@@ -38,6 +39,10 @@ def test_has_correct_package_weight
     assert_equal package[:weight], @rate_builder.as_json['RateRequest']['Shipment']['Package'][0]['PackageWeight']['Weight']
   end
 
+  def test_has_correct_return_service
+    assert_equal '10', @rate_builder.as_json['RateRequest']['Shipment']['ShipmentServiceOptions']['ReturnService']['Code']
+  end
+
   def test_has_correct_delivery_confirmation
     assert_equal '2', @rate_builder.as_json['RateRequest']['Shipment']['ShipmentServiceOptions']['DeliveryConfirmation']['DCISType']
   end
diff --git a/spec/ups/builders/ship_builder_spec.rb b/spec/ups/builders/ship_builder_spec.rb
index c7d070f..f953690 100644
--- a/spec/ups/builders/ship_builder_spec.rb
+++ b/spec/ups/builders/ship_builder_spec.rb
@@ -13,6 +13,9 @@ def setup
       builder.add_international_invoice invoice_form
       builder.add_description 'Los Pollo Hermanos'
       builder.add_reference_number reference_number
+      builder.add_return_service '10'
+      builder.add_usps_endorsement '1'
+      builder.add_package_id '1234'
       builder.add_shipment_delivery_confirmation '2'
       builder.add_shipment_direct_delivery_only
       builder.add_invoice_line_total('12', "GBP")
@@ -66,6 +69,18 @@ def test_has_correct_reference_number
     assert_equal reference_number[:code], @ship_builder.as_json['ShipmentRequest']['Shipment']['ReferenceNumber']['Code']
   end
 
+  def test_has_correct_return_service
+    assert_equal '10', @ship_builder.as_json['ShipmentRequest']['Shipment']['ReturnService']['Code']
+  end
+
+  def test_has_correct_usps_endorsement
+    assert_equal '1', @ship_builder.as_json['ShipmentRequest']['Shipment']['USPSEndorsement']
+  end
+
+  def test_has_correct_package_id
+    assert_equal '1234', @ship_builder.as_json['ShipmentRequest']['Shipment']['PackageID']
+  end
+
   def test_has_correct_delivery_confirmation
     assert_equal '2', @ship_builder.as_json['ShipmentRequest']['Shipment']['ShipmentServiceOptions']['DeliveryConfirmation']['DCISType']
   end