We have a subscription model which allows you to book tickets at a reduced price.
Currently when you try to book a ticket on our site, after having chosen your number and type of passengers (children, youth, adults, seniors), you are asked to check a box asking "subscribed passengers?" and an extra step will be added to your booking path, where you will be asked, for each passenger you've added, to say which one is subscribed.
This is a little clumsy and lengthy, especially since our subscribed users are, by definition, returning customers who want to book their tickets as fast as possible.
Some people in the team are worried that this may confuse "normal" users who aren't subscribed. Do you think this is a risk, or would the change be good practice? How would you test something like this?