/usr/share/click/hooks/push-helper.hook is in ubuntu-push-client 0.68+16.04.20160310.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Pattern: ${home}/.local/share/ubuntu-push-client/helpers/${id}.json
User-Level: yes
Hook-Name: push-helper
Exec: /usr/lib/ubuntu-push-client/click-hook
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