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cecibispo2017Asked on March 14, 2019 at 6:47 PM
paypal express error
na error has ocurred, please contact form administrator for assistence
security error
security header is not valid
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jherwinReplied on March 14, 2019 at 9:48 PM
The security header is not valid error usually means that there is an issue with provided API credentials.
Please re-check the PayPal API credentials on that form. Also, please note that PayPal API credentials for Live and Sandbox modes are different.