How do I test my checkout?
The only way to test your checkout properly, and be sure it is working, is to complete a test order through your checkout in the same way a customer would. To do this, you'll need to make sure that your order meets the minimum amount required to cover the payment gateway's transaction fees (normally $1 or higher).
We'd advise that all website owners check their checkout regularly and, if you have different payment methods available, check that each payment method works as intended.