Hello @ClickBankStore, Thank you for reaching out to the PayPal Community. The error "10002: Security header is not valid" you are experiencing is usually caused by incorrect API Credentials or API permissions for third-party calls. Check the API credentials you are using to ensure you have entered the correct credentials, including your API Username, Password, and Signature/Certificate. Any typos or incorrect information can cause authentication failures. Refer: https://www.paypal.com/us/cshelp/article/why-did-i-get-api-error-code-10002-ts1030 If you continue to experience the same problem, kindly create an MTS ticket via - https://www.paypal-support.com/ with detailed information. We will be happy to assist you. Sincerely, Saurav PayPal MTS
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