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docs(permalink): require explicit buyer action before cart merge #789

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docs(permalink): require explicit buyer action before cart merge #789

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5 changes: 5 additions & 0 deletions docs/specification/permalink.md
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Expand Up @@ -455,6 +455,11 @@ A Business MAY also require additional steps — such as verification, eligibili
or age gating, or authentication — before it constructs purchasable state, and
routes the buyer accordingly.

A Business MUST require an explicit buyer action on rendered permalink state
before merging that state into an authenticated buyer's existing cart. An
automatic merge performed on page load, on redirect, or through a pre-filled
submission does not satisfy this requirement.

A Business SHOULD apply query parameters it understands. Applied parameters may
affect server-side state or destination selection, and are not required to
appear on the redirect URL. UCP field-path query parameters SHOULD be consumed
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