I need some guidelines here. I am creating an online booking system for my client that interfaces with QuickBooks on their internal network (desktop QuickBooks, not online).
Do I need to go the full "publish app" route? I do not wish to sell this app in the marketplace. This is merely a custom booking system designed and paid for by the client. It seems like I need to "publish" the app in the marketplace for them to be able to use it.
Are there ways around this?