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+# API usage
+
+This document describes how a client uses buthd's API once he's [logged in](auth) (has a session cookie).
+
+An example: adding an item to the shopping cart.
+- Client `GET`s `shop./foo.html`
+ - Includes session cookie in request
+- httpd returns static page and scripts
+- Client interacts with page, e.g. presses "add to cart"
+- htmx `POST`s a form to `api./cart` containing `<sku>` and `<quantity>`
+ - Includes the session cookie in the request
+- `buthd` receives the request, extracts the session ID from the session cookie
+- `buthd` uses the session ID to look up the user's username by reading `/sessions/<id>/user` from [[authfs]]
+- `buthd` adds `<quantity>` units of `<sku>` to `<username>`'s cart using [[shopfs]]
+
+Other parts of the API behave similarly: client posts to buthd, buthd uses 9P servers to complete the request.
+
+TODO: define and document all of buthd's HTTP endpoints