Error: Security Header is Not Valid 10002 (PayPal)
If you are getting an error message within your shopping cart it will appear generic on the storefront.
To see the exact error message, go to Settings › Server Settings › Store Logs. Here you will see a more specific error message under the Type.
Security Header Not Valid 10002
This error indicates an issue with the login information you are using for your PayPal connection. It is usually seen with PayPal Standard Payments.
To resolve the error, follow the steps below.
1. Go to Settings › Store Setup › Payments, and click the PayPal Standard Payments tab.
2. Remove your credentials, then re-enter them. If you copied and pasted the data, make sure there are no spaces before or after the information. We recommend first pasting them into a text editing program such as Notepad or TextEdit to ensure this.
3. Make sure that you are not in test mode either on this page or within your PayPal account.