I am trying to set up Paypal Express Checkout. I am getting "Error: Security Header is Not Valid". What is the problem?
Response:
You likely have invalid credentials. Re-check your credentials and make sure you follow the setup instructions completely from https://www.nexternal.com/ecommerce/Nexternal_PayPal_In-Context_Express_Checkout_SetUp.pdf
We take your privacy seriously. The information you submit in this form will only be used to set up your free trial and correspond with you about the Nexternal eCommerce Platform. We will never sell it to a third party.
We take your privacy seriously. The information you submit in this form will only be used to correspond with you about the Nexternal eCommerce Platform. We will never sell it to a third party.
The email address you submit in this form will only be used subscribe you to our bimonthly eCommerce tips. We will not use your email address for anything else, and we will never sell it to a third party. We dislike spam as much as you do, and we take your privacy seriously. You can be removed from our list by clicking the unsubscribe button at the bottom of any email.
