Title: SetExpressCheckout Error
Last modified: August 30, 2016

---

# SetExpressCheckout Error

 *  Resolved [gremelle](https://wordpress.org/support/users/gremelle/)
 * (@gremelle)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/)
 * **Calling PayPal with action SetExpressCheckout has Failed**
 * Hi I am getting this error, even though I am not in sandbox mode. Any idea what’s
   causing it, and how to fix it?
 * Thanks 😀
 * [https://wordpress.org/plugins/paypal-digital-goods-payment-gateway-for-woocommerce/](https://wordpress.org/plugins/paypal-digital-goods-payment-gateway-for-woocommerce/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Thread Starter [gremelle](https://wordpress.org/support/users/gremelle/)
 * (@gremelle)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222736)
 * I recently updated to woocommerce 2.3.11, could it be a woocommerce issue?
 *  Plugin Author [johnwickjigo](https://wordpress.org/support/users/johnny-manziel/)
 * (@johnny-manziel)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222910)
 * Hello gremelle,
 * I just seen your email, I will check it and get back to you soon.
 * Thanks.
 *  Plugin Author [johnwickjigo](https://wordpress.org/support/users/johnny-manziel/)
 * (@johnny-manziel)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222911)
 * I have check this plugin on woocommerce 2.3.11 version, for me it’s working fine.
 * Why do I receive a “Security header is not valid” error?
 * On occasion when setting up PayPal Digital Goods and attempting to checkout for
   the first time, store managers encounter the following error:
 * Calling PayPal with action SetExpressCheckout has Failed: Security header is 
   not valid
    This indicates your API credentials are not valid for the transaction.
   Invalid API credentials can be caused by a few things:
 * Using sandbox API credentials for live transactions (or vice versa);
    Using API
   credentials for an account that has not been correctly set up to use PayPal Digital
   Goods; Incorrectly copy and pasted your API credentials – the API signature in
   particular can on occasion include a period character (.) which means when double
   clicking the signature to select it, only part of the signature will be selected.
 * Please also refer this [https://developer.paypal.com/docs/classic/api/apiCredentials/#navigate-to-the-api-access-page](https://developer.paypal.com/docs/classic/api/apiCredentials/#navigate-to-the-api-access-page)
 * Please mail me directly if any problem [phpwebcreators@gmail.com](https://wordpress.org/support/topic/setexpresscheckout-error/phpwebcreators@gmail.com?output_format=md)
 *  Thread Starter [gremelle](https://wordpress.org/support/users/gremelle/)
 * (@gremelle)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222912)
 * Thanks [@johnwickjigo](https://wordpress.org/support/users/johnwickjigo/)
 * I will check with paypal, it seems my issue is with the API Credentials
 *  Plugin Author [johnwickjigo](https://wordpress.org/support/users/johnny-manziel/)
 * (@johnny-manziel)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222913)
 * Thank you gremelle 🙂

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘SetExpressCheckout Error’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/paypal-digital-goods-payment-gateway-
   for-woocommerce_ffffff.svg)
 * [Paypal Digital Goods Payment Gateway For Woocommerce](https://wordpress.org/plugins/paypal-digital-goods-payment-gateway-for-woocommerce/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/paypal-digital-goods-payment-gateway-for-woocommerce/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/paypal-digital-goods-payment-gateway-for-woocommerce/)
 * [Active Topics](https://wordpress.org/support/plugin/paypal-digital-goods-payment-gateway-for-woocommerce/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/paypal-digital-goods-payment-gateway-for-woocommerce/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/paypal-digital-goods-payment-gateway-for-woocommerce/reviews/)

## Tags

 * [paypal](https://wordpress.org/support/topic-tag/paypal/)

 * 5 replies
 * 2 participants
 * Last reply from: [johnwickjigo](https://wordpress.org/support/users/johnny-manziel/)
 * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/setexpresscheckout-error/#post-6222913)
 * Status: resolved