Fires when the client needs to sync an new attachment
jetpack_sync_save_add_attachment
jetpack_sync_save_add_attachment-
action jetpack_sync_save_userFires when the client needs to sync an updated user.
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action jetpack_sync_callableTells the client to sync a callable (aka function) to the server
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action jetpack_full_sync_callablesTells the client to sync all callables to the server
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action jetpack_full_sync_theme_dataTells the client to sync all theme data to the server
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action jetpack_sync_current_theme_supportFires when the client needs to sync theme support info
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filter jetpack_sync_sender_should_loadFires on every request before default loading sync sender code. Return false to not load sync sender code that serializes pending data and sends it to WPCOM for processing. By default this returns true for cron jobs, POST requests, admin requests, or requests by users who can manage_options.
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filter jetpack_sync_listener_should_loadFires on every request before default loading sync listener code. Return false to not load sync listener code that monitors common WP actions to be serialized. By default this returns true for cron jobs, non-GET-requests, or requests where the user is logged-in.
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action jetpack_sync_save_termFires when the client needs to update a term
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action jetpack_full_sync_updatesTells the client to sync all updates to the server
Jetpack Developer Resources 