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Maurice
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Google charges autocomplete per request unless the requests carry a session token. With one, the keystrokes of a single search and the details lookup that ends it are charged together, which is also how a user experiences it: they looked up one place. TREK sent no token at all, so every debounced keystroke was its own billable request. On a busy trip that is the largest line on the Places bill, and it is paid by whoever owns the key, which for a self-hosted instance is the person running it. A session opens with the first suggestion request and closes when the user picks a result. It has to close on the abandoned paths too: a token carried into the next search would merge two searches into one billed session and scope the suggestions wrongly. So the search box clearing it, the text-search fallback and the error paths all end it. The token is validated on the way in. The autocomplete body goes through the Zod pipe, the details query does not, so the controller shape-checks it there. Anything that does not match Google's URL-safe 36-character form is dropped rather than forwarded, which falls back to per-request billing instead of breaking a lookup. A cached details hit never reaches Google and so never closes its session. That is billing-neutral: an unclosed session is charged as a plain autocomplete session, which is still cheaper than the per-request behaviour it replaces.