Update README.md

loqimean · Aug 2, 2024 · 397d6ad · 397d6ad
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@@ -89,6 +89,9 @@ class PaymentsController < ApplicationController
 end
 ```
 
+## Useful
+[Test cards](https://na-gateway.mastercard.com/api/documentation/integrationGuidelines/supportedFeatures/testAndGoLive.html?locale=en_US)
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.