Failed to integrate Woocommerce with Klaviyo. Error: Unable to access API (failed to authenticate)

Hi @Shimee!

Here are some common causes for this error:

1.  You are attempting to integrate with a site that is prefaced by http instead of https. 
   • You must have SSL enabled in order to integrate with Klaviyo
   • If you have SSL enabled, you must also have an adequate SSL grade (A is ideal). This can be checked here:
     • https://www.ssllabs.com/ssltest/analyze.html
        
2. Do you have any additional plug-ins that require additional authentication on top of WooCommerce? An example would be a JWT plug-in.
   • If so, can you attempt to disable these plug-ins and retry?
      
3. Do you have an extra Security layer or firewall?
   • For example, if you’re using CloudFlare and have bot-fight mode enabled, try disabling bot-fight mode and re-integrating.

If none of these apply, I would recommend opening a support ticket here:

• How to contact support

Best,

Brian