I am currently looking into the same thing with a shopify webstore.
I have worked with a company who bought wholesale in the past and we loved websites that you could enter with a password- do your shopping at wholesale prices and then have it shipped to you. Obviously we would create a user profile and enter a different website connected to the retail website.
I have found that the only solution to creating this experience for our wholesale customers is outlined in this doc: https://docs.shopify.com/manual/products/discount-codes/offer-wholesale-prices.
They say that you can open a second store that is password protected and have your product listed there. Is this the same information you found?
I would like to hear a follow up on your experience if you have any time to post here.