Thanks for the reply. We're using PayPal Standard, with no plugins. I have been testing with a business PayPal account for the receiving end, and a PayPal buyer account, set up in the PayPal developer dashboard. It was working fine until today. I finally took the time to test with some other accounts, and it's all resulting in a blank page, and the response is a 500 error. So, I'm thinking it's down. We haven't even gotten around to testing IPN yet. Of course, the plan was to launch tomorrow.
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