- Introduces SubscriptionContractCalculation object (early access, 2026-10 RC) to replace SubscriptionDraft for creating/updating subscription contracts with a calculate‑poll‑commit flow via the unified checkout engine.
- Consolidates dozens of draft mutations into a single calculate mutation, providing immutable previews of pricing, taxes, discounts, and new capabilities like bundle products and cart transforms.
- Requires apps using SubscriptionDraft to migrate (both APIs coexist for now); the old Draft object will be deprecated when the new API reaches GA, see migration guide.
SubscriptionContractCalculation API now available in early access
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