I think I found an answer on WooCommerce website (https://docs.woothemes.com/document/woocommerce-endpoints-2-1/.
It seems like WooCommerce has replaced pages with endpoint, so I don’t need the Dante theme page “Checkout => Pay”, but instead WooCommerce adds the endpoint to the checkout page.
Read this:
What endpoints replace from WC 2.0
In previous versions of WooCommerce, pages and shortcodes were used instead for endpoint content. Examples of endpoints in WooCommerce include:
Edit account page (previously a page with the [woocommerce_edit_account] shortcode).
Edit address page (previously a page with the [woocommerce_edit_address] shortcode).
Change password page (previously a page with the [woocommerce_change_password] shortcode).
Lost password page (previously a page with the [woocommerce_lost_password] shortcode).
View order pages (previously a page with the [woocommerce_view_order] shortcode).
Customer logout (previously a page with the [woocommerce_logout] shortcode).
Checkout pay page (previously a page with the [woocommerce_pay] shortcode).
Checkout thanks page (previously a page with the [woocommerce_thankyou] shortcode).
If you are upgrading WooCommerce and wondering why these shortcodes no longer function, it’s because they no longer exist. Although WooCommerce attempts to remove these pages during upgrade, they may remain if they have been customized.
Best regards
Morten