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Yahoo! JAPAN Web APIs

REST discovered

Details
Docs
https://developer.yahoo.co.jp/sitemap/
Authentication
Yahoo! JAPAN Client ID (Application ID) ?appid=<credential> + Yahoo! JAPAN Client ID (Application ID) User-Agent: <credential> discovered
Yahoo! JAPAN Client ID (Application ID) api_key Get key ↗

Sign in to Application Management with a Yahoo! JAPAN ID, then register an app at app registration to issue a Client ID / application ID. Use that ID as appid in query parameters, or append it to the User-Agent header as Yahoo AppID: <Client ID> per the request guide.