New Customer Accounts

I have some technical questions related to New Customer Accounts and how it will effect my client’s store.

  1. Is there any way to white label new customer accounts? When I preview, it seems that new customer accounts/login pages will live at a shopify.com URL. Can this remain under my domain’s umbrella? Having customer facing pages of my client’s shop live at shopify.com cheapens their eCommerce presence.
  2. How will this effect a custom app (using app proxy) my client uses on their store that is written in Ruby on Rails and relies on logged_in_customer_id. I’m reading that this is no longer a reliable source in New Customer Accounts (Logged_in_customer_id erroneously empty with new customer accounts / app proxy)

For reference, it appears the first question has an answer, it can live at a subdomain: https://help.shopify.com/en/manual/customers/customer-accounts/customize-customer-accounts/connect-domain-customer-account

you can have a subdomain for your customer account like account.example.com

for app proxy
if its in the storefront it will work normally
but in the customer account you need to work on the backend because it doesnt app proxy
it uses session