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I don't uderstand SSL

PostPosted: 13. March 2010 03:19
by crankyslap
I'm trying to install a PayPal API and they force me to use SSL, something I never used before.

I'm using the API to create a paypal button. The button gets created, but when I click it I receive this error message: The certificate has expired. Please use a valid certificate.

Where do I go from here? I haven't the slightest idea what to do :?: