Implementing Membership Benefits in Shopify Spa Store

[zerorevenger]

I need help with developing a Shopify store for a spa. The store exclusively offers services that are provided within the establishment.

I have implemented a reservation system that allows users to make a purchase and book the service simultaneously. Additionally, we offer a membership program that provides the following benefits:

1. 10% discount on all purchases.
2. Two free reservations to choose from among four specific services.

I have managed to implement the 10% discount through a coupon system that is automatically applied to all purchases for members. However, I am having difficulties implementing the free reservation feature.