I cannot get express checkout to work with a magento store, seemingly no matter what I do. Does express checkout require SSL? I woulden't think so as it redirects to paypals domain... correct? Or does it want SSL any ways? I don'y have SSL yet and that could be the problem. The exact error message is. PayPal gateway has rejected request. Security header is not valid (#10002: Security error). I also understand that 9/10 times it's incorrect credentials due to whitespace, live credentials on sandbox, or sandbox credentials on live. As best as I can tell, the credentials are correct for live node point. I also understand that you must explicitly accept incoming payment from 3rd party stores. It was set to this setting by default, and I went ahead and hit the submit button to accept payment any ways. Still nothing. I have also attempted to use the same credentials with paypal standard to no avail. Switching the mode and the credentials to sandbox seems to cause it to simply do nothing instead of give an error. It certainly doesn't ask for payment. help?
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