Error on my paypal in prestashop 1,5.1

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I can not get my paypal to work, there are some who know what is wrong. PayPal response: TIMESTAMP -> 2013-07-08T22:07:35Z L_ERRORCODE0 -> 10002 L_SHORTMESSAGE0 -> Security error L_LONGMESSAGE0 -> Security header is not valid L_SEVERITYCODE0 -> Error
Hello isabella! Sorry to hear about the Paypal error. If you have not already, please see our tutorial on Installing and configuring the Paypal module in PrestaShop 1.5. This error is an Authentication/Authorization Failed error code. PayPal says, "This error can be caused by an incorrect API username, an incorrect API password, or an invalid API signature. Make sure that all three of these values are correct. For your security, PayPal does not report exactly which of these three values might be in error. " 10002 Authentication/Authorization Failed Double check your PayPal credentials to see if you have the correct PayPal information or t if the connection is actually sending the data (ie, that your domain points to us and that you are testing on the correct server and not locally). Best Regards, James R