Errorcode 10002

[Frank76]

This is the message that appears in my prestashop web when finalice order:

Error occurred:

Please try to contact the merchant:

1. <b>PayPal response:</b>
2. TIMESTAMP -> 2016-11-28T23:24:16Z
3. L_ERRORCODE0 -> 10002
4. L_SHORTMESSAGE0 -> Security error
5. L_LONGMESSAGE0 -> Security header is not valid
6. L_SEVERITYCODE0 -> Error

How can I solve it?

Thanks

[kernowlass]

@Frank76

Not sure if this link will help but its all i have got !!

http://kb.modularmerchant.com/paypal-pro-error-id-10002-a673.php

[Frank76]

Thanks but i know what was the problem, I asked for API certificate instead of API signs.