To set this up you'll need to:
• Create two tags: Standard customer, Class pass customer
• Create 2 sequences: to tag, and remove tags from customers
• Restrict purchases of the package or subscription by tag -- only allow Standard customers to purchase it
Create tags
Click Customers > Tags > Create tag > make them each applicable to customers. Create a badge if needed. This can help you identify who's who later on at a glance.
Side note: if you don't want the badges for these tags showing up in customer lists like a class signup list, you can skip the 'badge creation' step when creating tags. Tags are not visible to customers.
Tag 1
Tag 2
Create Sequence 1
Click Marketing > Sequences > Create > Sequence from Scratch
Trigger: class signup
Counter condition: customer has tag: class pass customer
Action: tag the customer using "Standard Customer"
Submit & Enable sequence
Sequence 2
Trigger: number of class pass bookings / trigger on every booking
Action 1: Tag the customer as a class pass user
Action 2: remove the "Standard Customer" tag
Submit & Enable sequence
Edit pack/subscription to restrict purchases by tag
Locate the subscription or pack, click Edit > scroll to Additional Settings > Restrictions > choose that Standard tag > click Save.