The best time to find a checkout problem is before a customer reaches it. Once WordPress is configured for Cybersource, test the flow using the environment and procedure supported by your payment plugin. A successful save is a starting point, not proof that every checkout step works.
Use the documented test method
First confirm that the plugin and Cybersource account are both set to the same test or sandbox environment. Use only the test payment details and steps provided in the relevant documentation; real card details do not belong in a test transaction. If the plugin has no documented test process, ask its provider what procedure applies before trying to simulate a payment.
Run a test from the customer-facing checkout, not just from the settings page. Check that the payment option appears where expected, the checkout accepts the required information, and the next screen or message matches the plugin’s documented behavior. Do not assume that a particular approval message or dashboard label will be identical across integrations.
Check the full checkout path
After the test, review what the shopper would see: the order summary, payment step, confirmation, and any follow-up message. Then check the order record or payment status in the places your plugin documentation identifies. If the test stops partway through, note the last completed step and the exact message shown.
When something fails, check the basics in order: the selected environment, the matching credentials, and whether the plugin’s Cybersource setup instructions were followed. Keep a short record of the time, error text, plugin version, and steps taken. That gives support teams useful context without exposing account credentials.
Switch to live deliberately
Only switch to live processing after the documented test has completed and you understand how the live credentials and settings differ. Recheck the environment selector and confirm that the site’s checkout presents the expected payment option. If you are unsure whether a test or live setting is active, stop and verify it before accepting customer payments.