Security Heading Error When Trying To Connect My PayPal account to my website

[ClickBankStore]

I keep getting a security header error when trying to connect my PayPal account to my website. I entered the API credentials to the letter. Can someone help me fix this issue?

[MTS_Saurav]

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