Security header is not valid
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Hi guys,
Awesome plugin! Pretty much all the functionalities are working great. But only when I add a payment (PayPal Sandbox, configured properly with API key/signature) and the invoice is sent via email and the PayPal button is clicked, it goes to the following URL:
https://wpfree.devhtmlfive.com/payment/ (which is our test site and the payment page is created by the plugin) and every time we get the following error:Error Code: 10002
Security header is not validThe page I need help with: [log in to see the link]
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