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

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# ERROR: Security header is not valid.

 *  Resolved [techbygeorge](https://wordpress.org/support/users/techbygeorge/)
 * (@techbygeorge)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/error-security-header-is-not-valid/)
 * 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.
 * [https://wordpress.org/plugins/pal-shopping-cart/](https://wordpress.org/plugins/pal-shopping-cart/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * (@wpgateways)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/error-security-header-is-not-valid/#post-7435672)
 * We checked from our end, it seems working fine for us.
 * Can you please direct contact me at [wpgateways@gmail.com](https://wordpress.org/support/topic/error-security-header-is-not-valid/wpgateways@gmail.com?output_format=md)
   for further assistance and it will easy for us.
 * Thanks!
 *  Plugin Author [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * (@wpgateways)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/error-security-header-is-not-valid/#post-7435780)
 * We have direct communicate with email, now issue is resolved.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘ERROR: Security header is not valid.’ 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/)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/pal-shopping-cart/unresolved/)
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## Tags

 * [header](https://wordpress.org/support/topic-tag/header/)
 * [not](https://wordpress.org/support/topic-tag/not/)
 * [valid](https://wordpress.org/support/topic-tag/valid/)

 * 2 replies
 * 2 participants
 * Last reply from: [wpgateways](https://wordpress.org/support/users/wpgateways/)
 * Last activity: [9 years, 11 months ago](https://wordpress.org/support/topic/error-security-header-is-not-valid/#post-7435780)
 * Status: resolved