Advice for using subscriptions option as a package for multiple services?

[massagegrottosf]

Hi folks, 

We are a small massage therapy business switching over to square appointments and payroll. We currently offer 5 and 10 packs of massages through Acuity/squarespace. We would like to do something similar through square. It looks like our best option will be to make the package a subscription. I am aware that we will have to keep track of how many sessions have been completed. I am wondering for bookkeeping if any of you have suggestions that would help us to use subscriptions for packages and to keep track of where clients are in the package. 

One thought is to use a promo code when they are booking and enter something like "session-1" the first time etc. 

Has anyone done this? 

Any thoughts or advice would be greatly appreciated!

[renewrm]

Were you able to find a solution? I am in the same boat as you