Apart from downloading Form BD-25 (PDF)
and submitting them in paper form, you may now choose to download the
Form BD-25 (Rich Text Format)
which facilitates you to fill-in, sign with digital signature and send electronically to BD through electronic mail to the email address
receipt@bd.gov.hk. The identity of the person submitting the form has to be authenticated by a digital certificate issued by the Postmaster General or other certification authorities recognized by the Director of Information Technology under the
ETO.