Varial Posted December 15, 2010 Share Posted December 15, 2010 I'm getting the error "Security header is not valid" when activating the PayPal addon. My API username/password/signature is correct so I'm not sure what this is about. Any ideas? 0 Quote Link to comment Share on other sites More sharing options...
WHMCS CEO Matt Posted December 15, 2010 WHMCS CEO Share Posted December 15, 2010 This is not a bug as otherwise it wouldn't be working for anyone. One of the details in either username/password or signature must be incorrect so double check those. Matt 0 Quote Link to comment Share on other sites More sharing options...
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