Payment Plan Option for packages

I sell packages for my sessions but don’t require my clients to book all sessions in advance.

I would love to be able to offer session packages with the options to:

1. Pay in full upfront for all sessions within the package with a discount applied

or

2. To pay off the total cost of all the sessions included in the package using a payment plan.

I want them to only have to book the first session upon purchase for both options.

I would also love if the client and myself can both keep track of how many sessions that have been used and how many are remaining in the package if this isn’t already possible.