release: 0.103.0

[kernel-internal]

Automated Release PR

0.103.0 (2026-09-14)

Features

• Add single-use AgentCard prepare_checkout for Square (ec63b01)

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Note

Medium Risk
Adds payment-checkout vault operations and reshapes authorize request types, which can break callers still using the removed authorize param struct.

Overview
Release 0.103.0 bumps package/docs version strings and changelog; the functional change is vault AgentCard Square checkout preparation.

Clients can call prepare_checkout on eligible unused AgentCard items via VaultItemPerformOperationParams.OfPrepareCheckout, supplying required VaultCheckoutContextParam (browser_id, environment, merchant_origin). Responses expose AgentcardCheckoutPreparation (approval URL, status lifecycle, expires_at) on AgentCard item state, alongside expanded status values such as preparing, ready_to_submit, and consumed.

Authorize for Link cards is now typed as AuthorizeVaultItemOperationRequestParam (replacing VaultItemPerformOperationParamsBodyAuthorize and the shared constant.Authorize helper). Available-operation metadata and API docs now distinguish Link authorize from AgentCard prepare_checkout and describe single-use preparation and abandonment rules for recovery_required cards.

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