Thanks for your reply!
Normally, when we receive custom requests from our customers, we suggest the default WooCommerce hooks.
I did try that, with the two “woocommerce_…” hooks I mentioned, but during my debugging it seemed like those are not executed when using the custom checkout, hence my question.
To thoroughly look into the matter, can you please raise a ticket through our website? We hope our technical team will be able to help you.
Will do! Thanks again 🙂