Hi @spargut,
I can confirm our team is working to transition to the new WooCommerce V3 API and compatibility with the HPOS but we do not have a release date for this update yet.
If you would like to stay updated about the move to the WooCommerce V3 API, or you are experiencing issues related to the Sendcloud plugin, please submit a support ticket directly from your Sendcloud account. We will start an investigation or we will link your support ticket to any already ongoing investigation to ensure you will be notified by our Support Team as soon as the issue is resolved.
Below is more information on how to create a support ticket:
https://support.sendcloud.com/hc/en-us/articles/360046514071-How-to-get-support-from-Sendcloud
Best regards,
Matthew | Sendcloud