Hope you are doing well!
I came across your post and yes, I have worked on installing the Wholesale Club app for many of my Client's stores.
So basically, you need to add the tag for Customers in the backend to decide if they are wholesale customers and the price that needs to be shown to them.
The customer then needs to register into the website by filling the form by using below form builder app. Once successfully registered, the customer will be assigned the respective tag and then this Wholesale club app works.
Please feel free to reach out for any further changes.