You may find the need to test for do further testing for your site to ensure that all the bases are covered.
In the event that you’d want to simulate a failed transaction, you can check out all the possible Ingenico card numbers here – https://epayments.developer-ingenico.com/documentation/testcases/
For example, you want to simulate failed Visa transactions, you’ll have to check the shared link above look for Visa > then check the Negatives section:
Another way of getting the available testing cards that you can use for your Ingenico account can be fetched from your Ingenico backoffice account > Configuration > Technical Information > Test info > Look at the test card numbers available for you to use:
To do a failed order you would need the add products to your WooCommerce cart and the total has to be over 9000 euro with the card numbers below being used.