Does anyone know if there are test card numbers that simulate failed transactions for Cybersource secure acceptance? I have searched the docs and can only find successful payment card numbers
Credit card numbers do not trigger errors. Instead it is usually the amount of the transaction. You can see a list of errors and their triggers here: https://developer.cybersource.com/api/developer-guides/dita-cybs-so-test-data/so_overview.html / omegleshagle /voojio
Note that errors are grouped by the payment processor you are setup for. The default for a test account is Chase Paymentech.