How do I resolve the "Security header is not valid" error message?

This error message means your Paytronix Online Ordering account is not properly configured to process credit card transactions.

To fix this error, Verify a few details under the Order Payment section of the Dashboard:
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1. Make sure you are using live credentials, and not the credentials from PayPal Sandbox
2. Make sure you entered the correct PayPal information by following the instructions in this article: How do I connect PayPal Pro to my Paytronix Online Ordering account?
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If you believe your API information is being entered correctly, please try re-keying your PayPal API credentials by taking the following steps within PayPal:

After deleting your current API information, try resetting your API information by following these steps.