I have uploaded paypal v1.4 ( THANK YOU VGER) it went without a problem. Now I already have api credentials with my paypal account, but it asks for your private key, your public cert., paypals public cert., and your paypal public cert. Id. Where do I go for all that. I do have paypal_cert_pem.txt, and I downloaded a public cert. from paypal site, but how do I know which one is which, and where do I get private key?