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The Upgrade Pass

Used by the app, not by scripts. Everything a script can do is free, and none of these endpoints affect sending.

Method Path Notes
GET
/v1/pass
{windows, features, history_days}: the resolved entitlement set
POST
/v1/pass/redeem
{"transactions": ["<jws>", …]} from StoreKit's Transaction.all. Idempotent. Anything refused comes back named in refused rather than being dropped.
POST
/v1/pass/notify
App Store Server Notifications V2. Called by Apple, not by you: it carries no key, and the JWS signature is the authentication.

Every signed payload is verified against a pinned Apple Root CA - G3, not the system trust store, and checked for this bundle id, this product and an accepted App Store environment. A transaction is bound to one account by appAccountToken; presenting someone else's is refused by name.