Security header is not valid (Transaction Error) something is wrong.
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I trying to test this plugin functionality through “American Express” credit card type and get:
Security header is not valid
(Transaction Error) something is wrong.I’m enabled sandbox mode in admin and after that I use test data from: https://www.paypalobjects.com/en_US/vhelp/paypalmanager_help/credit_card_numbers.htm
Card Type: American Express
Expiration Date: 10.2016
Card Number: 378282246310005
Card Verification Number (CVV): 1234After validation I have this message in notification box:
Security header is not valid
(Transaction Error) something is wrong.
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