Hooks & Filters

Actions/filters this plugin listens to

Hook	Type	Purpose
`bp_parse_query`	action	registers the BuddyPress member/group “Add Contact” link hooks
`wp_dashboard_setup`	action	adds the “Latest Vcards” dashboard widget
`user_row_actions` / `ms_user_row_actions`	filter	adds the “Add Contact” row action on the users list screen
`lh_bg_reports_fields` / `lh_bg_reports_field_output`	filter	adds a Vcard column to LH Buddypress Group Reports
`bbp_theme_after_reply_author_admin_details`	action	adds a Vcard link to bbPress reply author details
`init` / `query_vars` / `wp_loaded` / `parse_request`	action, filter	the CardDAV endpoint: rewrite rules, query vars, a one-off rules flush per site, and dispatch
user, user meta, xProfile, avatar and BuddyPress group hooks	action	record when each card last changed on each site (its REV): registration, joining or leaving a site, profile updates, tracked meta, xProfile data, avatars, group membership, and group renames or status changes
`set_object_terms` / `deleted_term_relationships`	action	a member blocked or unblocked through LH Buddypress Block Members leaves or rejoins the address book

Hook	Type	Purpose
`lh_vcard_add_data`	filter (`$add`, `$user_id`, `$viewer_id`)	the main extension point – add or modify fields in the array that becomes the card. `$viewer_id` is the user the card is built for. `lh-profile-page` uses this to add phone, address and other fields.
`lh_vcard_return_all_tracked_meta_fields`	filter	user meta keys whose changes mark a card as changed (default: nickname, first_name, last_name, description). A plugin adding card data from its own meta should add its keys here.
`lh_vcard_return_view_vcard_capability`	filter	the capability needed to see vCard links and to use the CardDAV address book (default: `publish_posts`)
`lh_vcard_signed_link_ttl`	filter	how long a download link stays valid, in seconds (default: `DAY_IN_SECONDS`)
`lh_vcard_return_photo_size`	filter	photo size in pixels (default: 256)
`lh_vcard_carddav_user_query_args`	filter	`get_users()` arguments for the CardDAV address book (default: members of the current site); blocked members are always removed afterwards
`lh_vcard_carddav_base_path`	filter	the CardDAV path (default: `carddav`)
`lh_vcard_block_taxonomy`	filter	the user taxonomy whose `blocked` term removes a member from the address book (default: `lh_bp_bms_block_status`)
`lh_vcard_tombstone_lifetime`	filter	how long removals are remembered for sync, in seconds (default: 90 days, minimum one day)
`lh_vcard_do_widget_user`	filter	customise the HTML for one user’s row in the dashboard widget’s list

GET /wp-json/lh-vcard/v1/download – user_ids (comma-separated) and token query params. Publicly reachable; the signed token is the gate. See Architectural Notes.
/carddav/ – the CardDAV address book (WebDAV, not REST), with /.well-known/carddav redirecting to it. See CardDAV Address Book.