How do subscription products work in CPQ? Explain subscription types and pricing methods.

Subscription products have SBQQ__SubscriptionType__c set on the Product record. The three types are:

1. Renewable: The product creates a Subscription record when contracted and is eligible for renewal quotes. Most SaaS products use this type.
2. Evergreen: Creates a Subscription record but is never included in renewal quotes — it continues indefinitely until manually cancelled. Suitable for metered or open-ended services.
3. One-Time: Does not create a Subscription record; it is treated as a one-time charge despite potentially being on a subscription quote. Subscription Term: Defined on the quote; the duration (in months) drives pro-rata pricing if the subscription term differs from the standard term. Pricing Method on the product: (a) Fixed Price: A flat price per subscription term regardless of quantity. (b) Per Unit: List price × quantity × (subscription term / 12) for annual normalisation. (c) Percent of Total: Price is a percentage of the total of other lines (e.g., a support contract priced at 20% of platform licenses).