Opt-in: paste an itch.io API key under My itch.io purchases in the store's
sources dialog. It is checked with GET /profile, saved 0600 in the app data
dir (itch-account.json), and only ever sent to api.itch.io as a Bearer
header. A new "itch.io (my purchases)" source lists owned Android games
(/profile/owned-keys, all pages), labelled "Owned on itch.io"; installs
pick the best Android upload (/games/ID/uploads) and download it through
/uploads/ID/download into the normal APK install path. A refused key is
never saved, or is deleted if itch.io later revokes it; rate limits and
network errors stay per-source and readable. The key is kept out of URLs,
errors, logs, API responses and the page.
Tests use recorded JSON and a fake HTTPS layer under urllib's real opener.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>