docs/Expiration.md in first_data_gateway-1.2.0 vs docs/Expiration.md in first_data_gateway-1.3.0

@@ -1,9 +1,19 @@
 # OpenapiClient::Expiration
 
 ## Properties
+
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **month** | **String** | Month of the card expiration date. | 
 **year** | **String** | Year of the card expiration date. | 
+
+## Code Sample
+
+```ruby
+require 'OpenapiClient'
+
+instance = OpenapiClient::Expiration.new(month: 03,
+                                 year: 21)
+```