MediaWiki:Apihelp-block-param-watchlistexpiry
From MoodleDocs
Watchlist expiry timestamp. Omit this parameter entirely to leave the current expiry unchanged.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: Apihelp-block-param-watchlistexpiry.