Adding Schedules and Subscriptions

Hi,

I'm just setting up my website and am trying to add scheduled appointments and also subscriptions for a certain amount of sessions each month. 

I'm a little confused. I'm still on my trial period until the end of the month.

Do I need the plan that includes subscriptions within Squarespace, or do I need to sign up separately for Acuity which seems to be integrated in Squarespace.  I don't want to end up paying twice for the same thing.

Thank you,

Frasser