I'd be more than happy to assist you. While eBay and PayPal are linked somewhat. The username and password ***** be different. I suggest using the Forgot Password ***** on PayPal site, once you've reset your password, try to do your purchase again through eBay which will then redirect you again to PayPal. If that resolves your issue, please rate my answer. If you still have questions or that didn't resolve your issue please REPLY back instead. Thank you.