When viewing the roster in List View, there will be some helpful information to the right of the customer's name:
You'll be able to view how many classes the customer has taken. This number is based on total check-ins.
You'll see what payment option they used to book the class.
If it was booked with a credit package, you'll see "Credit: X/Y" with the expiration date of the credit package. X/Y indicates how many credits they have left in their credit package.
Hovering over this information will specify the name of the credit type.
Reservations made with a membership will display the name of the membership next to the class count. If the membership is a limited-use membership, it will display how many usages they have in their payment cycle, i.e. 7/20. If the membership is an unlimited membership, the name of the membership will appear.
If there is an expiration date for the membership, the expiration date will be visible as well.