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Recently started administrating a store for a client. His existing CubeCart store is version 3.0.17 (PHP 5.2.17, MySQL 5.5.29-log). Current gateway is Paypal IPN. We are currently not able to accept credit cards since CC only partners with Paypal on Express Checkout from everything I can find. Under the Express Checkout gateway, I am supposed to make sure the API is pointed to this particular URL, but underneath that states "This file does not currently exist." How do I get the API certificate and will the URL for it to point to work? Is there any kind of users manual available online for this old version? Am I just out of luck on such an old version?