Title: API Issues
Last modified: December 7, 2022

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# API Issues

 *  Resolved [fapoo](https://wordpress.org/support/users/fapoo/)
 * (@fapoo)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/api-issues-4/)
 * Hello, I am currently testing the woocommerce rest api and I met a problem. When
   I request the list all orders with （per_page=2,offset=1）, everything is OK.
   But after I added the parameter of modified_after and modified_before, it returns
   that”code=woocommerce_rest_authentication_error, message=Invalid signature – 
   provided signature does not match., data={status=401}”. I have converted my timestamp
   to ISO8601 compliant date. Could someone help me?

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [Fernando Marichal](https://wordpress.org/support/users/fermarichal/)
 * (@fermarichal)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/api-issues-4/#post-16269412)
 * Hello [@fapoo](https://wordpress.org/support/users/fapoo/),
 * Thank you for reaching out. It seems like you have an authentication issue:
 * > message=Invalid signature – provided signature does not match
 * This is covered in the WooCommerce REST API documentation:
 * [https://woocommerce.github.io/woocommerce-rest-api-docs/#authentication-over-https](https://woocommerce.github.io/woocommerce-rest-api-docs/#authentication-over-https)
 * I hope my answer helps.
 *  Thread Starter [fapoo](https://wordpress.org/support/users/fapoo/)
 * (@fapoo)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/api-issues-4/#post-16279791)
 * Thanks for your reply, Fernando,
    But when I request without parameters of modified_after
   and modified_before, it works well and authentication issue doesn`t happen. Could
   you help me to test it?
 *  [anastas10s](https://wordpress.org/support/users/anastas10s/)
 * (@anastas10s)
 * [3 years, 5 months ago](https://wordpress.org/support/topic/api-issues-4/#post-16288605)
 * Hi there [@fapoo](https://wordpress.org/support/users/fapoo/),
 * Thank you for reaching out.
 * This is a fairly complex development topic. I’m going to leave it open for a 
   bit to see if anyone is able to chime in to help you out.
 * I can also recommend the WooCommerce [Developer Resources Portal](https://developer.woocommerce.com/)
   for resources on developing for WooCommerce.
 * You can also visit the [WooCommerce Facebook Community](https://www.facebook.com/groups/advanced.woocommerce/)
   group or the `#developers` channel of the [WooCommerce Community Slack](https://woocommerce.com/community-slack/).
   We’re lucky to have a great community of open-source developers for WooCommerce,
   and many of our developers hang out there, as well.
 * Cheers.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘API Issues’ is closed to new replies.

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 * 3 replies
 * 3 participants
 * Last reply from: [anastas10s](https://wordpress.org/support/users/anastas10s/)
 * Last activity: [3 years, 5 months ago](https://wordpress.org/support/topic/api-issues-4/#post-16288605)
 * Status: resolved