I am getting this error when testing a purchase on my new online shop: Please refer to logs: PayPal response: TIMESTAMP -> 2012-12-04T19:14:25Z L_ERRORCODE0 -> 10002 L_SHORTMESSAGE0 -> Security error L_LONGMESSAGE0 -> Security header is not valid L_SEVERITYCODE0 -> Error Can anybody advise me, I can't find any help on the PayPal site.
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