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This is the message that appears in my prestashop web when finalice order: Error occurred: Please try to contact the merchant: <b>PayPal response:</b> TIMESTAMP -> 2016-11-28T23:24:16Z L_ERRORCODE0 -> 10002 L_SHORTMESSAGE0 -> Security error L_LONGMESSAGE0 -> Security header is not valid L_SEVERITYCODE0 -> Error How can I solve it? Thanks
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