post
https://apis.kentro.live/store/v1/cart.restore
Makes a retained guest cart (id, pinned with its ownershipVersion) the current guest cart again; other guest carts are retained. Idempotent per idempotencyKey.
Who may call it: A guest (X-Storefront-Guest) or a signed-in buyer (X-Storefront-Buyer); without either the answer is 401 UNAUTHORIZED.
