“We expected status code 2XX with content type "application/json" but instead received status code 503 with content type text/html; charset=UTF-8 after making a GET request to….”
If you are getting this error in XPS Ship when using WooCommerce this is likely caused by the firewall blocking the request from XPS Ship.
To resolve you will need to contact your hosting ISP or network administrator to white list the following IP Addresses:
54.86.229.202
184.72.99.198
107.22.199.173