If you have code customizations on top of CheckoutWC, we recommend perusing this list to ensure that you aren’t using any of these removed actions and filters:
cfw_after_customer_info_tab_login
cfw_after_login_button
cfw_before_customer_info_tab_login
cfw_cart_summary_before_admin_page_form_close
cfw_checkout_after_login
cfw_checkout_after_main_admin_page_controls
cfw_enable_enhanced_login
cfw_form_field_append_optional_to_placeholder
cfw_form_field_element_
cfw_general_admin_page_after_fields
cfw_input_row_wrap
cfw_input_wrap_end
cfw_input_wrap_start
cfw_login_optional_text
cfw_woocommerce_form_field_