Title: Security header is not valid error
Last modified: August 31, 2016

---

# Security header is not valid error

 *  Resolved [dileepggdev](https://wordpress.org/support/users/dileepggdev/)
 * (@dileepggdev)
 * [10 years ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/)
 * Hi ‘m developing a website for my client but I’m getting Error: Security header
   is not valid error.Can you please help.
 * [https://wordpress.org/plugins/pal-shopping-cart/](https://wordpress.org/plugins/pal-shopping-cart/)

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Author [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * (@wpgateways)
 * [10 years ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-7347032)
 * Hello [@dileepggdev](https://wordpress.org/support/users/dileepggdev/),
 * Generally this error means you are not using the correct API credentials. If 
   you are convinced your credentials are correct then take a look at your endpoint.
   Sandbox credentials will not be valid in the production environment and live 
   credentials will produce this error in the sandbox
 * Thanks!
 *  Thread Starter [dileepggdev](https://wordpress.org/support/users/dileepggdev/)
 * (@dileepggdev)
 * [10 years ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-7347173)
 * [@wpgateways](https://wordpress.org/support/users/wpgateways/) Can you please
   tell me which APP we need to create.Seems to be our client is confused to create
   the APP.
 *  Plugin Author [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * (@wpgateways)
 * [10 years ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-7347177)
 * Hello [@dileepggdev](https://wordpress.org/support/users/dileepggdev/),
 * No, you no need to create APP for that, just grab Credentials from below url.
 * [Obtain Sandbox API Credentials](https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_login-api-run)
 * [Obtain Live API Credentials](https://www.paypal.com/us/cgi-bin/webscr?cmd=_login-api-run)
 * Let me know if any.
 * Thanks!
 *  [techbygeorge](https://wordpress.org/support/users/techbygeorge/)
 * (@techbygeorge)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-7347263)
 * Hello [@wpgateways](https://wordpress.org/support/users/wpgateways/),
 * I have the same error when clicking on the Check Out button.
    ERROR: Security
   header is not valid.
 * I have verified my API credentials are correct. Above, what do you mean ‘take
   a look at your endpoint’? I am not using Sandbox creds.
 * Thanks very much.
 *  Plugin Author [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * (@wpgateways)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-7347266)
 * We have direct contact on email, now issue has been resolved.
 *  [Anita Hill](https://wordpress.org/support/users/anita-hill/)
 * (@anita-hill)
 * [9 years, 4 months ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-8626702)
 * I’m having the same problem. Re-entered the credentials, removed all sandbox 
   credentials, and it is still giving me the same error.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘Security header is not valid error’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/pal-shopping-cart_f6f6f6.svg)
 * [PayPal Shopping Cart](https://wordpress.org/plugins/pal-shopping-cart/)
 * [Support Threads](https://wordpress.org/support/plugin/pal-shopping-cart/)
 * [Active Topics](https://wordpress.org/support/plugin/pal-shopping-cart/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/pal-shopping-cart/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/pal-shopping-cart/reviews/)

 * 6 replies
 * 4 participants
 * Last reply from: [Anita Hill](https://wordpress.org/support/users/anita-hill/)
 * Last activity: [9 years, 4 months ago](https://wordpress.org/support/topic/security-header-is-not-valid-error/#post-8626702)
 * Status: resolved