Support » Plugin: MarketPress - WordPress eCommerce » connect shopping cart to pay pal

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Support Jorge – WPMU DEV Support


    Hi There

    Many thanks for getting in touch.

    Are you using PayPal express or a different PayPal gateway?

    You will need to create an API signature from PayPal in order to connect it to Marketpress instructions for that can be found here:

    Once thats done enter the information in the PayPal gateway settings in the plugin and set it to “Live”

    If you still have issues after that then please get back to us and we will be happy to help.

    Have an awesome day!


    API signature was already added and set to Live. When I attempt to checkout I get the error message “Header is not valid”.

    Plugin Support Nastia – WPMU DEV Support


    Hello, I hope you are doing well today!

    That error message would typically only show when the credentials are incorrect.

    Would you please double check that there’s no extra space characters in the credentials and that you’re using the credentials for the correct mode you’re using (Live vs. Sandbox)?

    Please let us know hot it goes!


    Plugin Author jdailey


    Thank you for using MarketPress. I am going to mark this topic resolved because we haven’t heard from you in a while. If this issue was not resolved we can reopen it. Thanks again!

Viewing 4 replies - 1 through 4 (of 4 total)
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