Support » Plugin: Paid Memberships Pro » Security header is not valid

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Author Jason Coleman


    Which payment gateway are you using? And version of PayPal if you are using PayPal.

    Are your API credentials/etc set correctly? Double check them.

    Hi! thank you very much!

    I have changed it form sandbox/testing to live/production and it seems that work now… what is the difference between them? i was using sandbox/testing before updating but i dont know what they mean.

    p.s.)sorry about my english! 😉

    Plugin Author Jason Coleman


    That will do it too.

    Sandbox/testing requires a different PayPal account setup at and is for … testing. The live account is your actual PayPal account for real money.


    Thank you, boss! it may be changed when i update the plugin or the WP version.

    Thank you so much! 😉

Viewing 4 replies - 1 through 4 (of 4 total)
  • The topic ‘Security header is not valid’ is closed to new replies.