We would strongly recommend implementing this extension in a development environment before putting it live.
You need to set up the Woocommerce store to use the test account details as supplied by the First Data Connect team.
We would also recommend setting up the “test” First Data Connect back-office and enabling the test mode within the settings page. The First Data Connect test environment looks like this:
At the time of this writing, You can then use the test-card number below to make sure that a transaction fully completes.
Expiry Date: Any date in future
Card Security Code: any three-digit value
If it does not work anymore, you could contact the First Data Connect team here- firstname.lastname@example.org or at their contact page here, and they’ll be able to supply you with the working ones.