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* 10002 - Security error - Security header is not valid


    Greetings remondini2,

    Welcome to WPMU DEV!

    Please do not test in sandbox mode which only gives erratic behavior and cannot be depended upon.

    Please go live triple checking you PayPal credentials and making sure that none of them have a space/blank at the beginning nor end which is so common to copy and paste.

    This error is a direct indication that the API Keys are not valid.

    Please advise.

    Cheers, Joe


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