Once your application is approved, you will be asked to visit an Enrolment Centre to finalize your enrolment and provide a digitized signature.
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Hope this guide helped you out.
You need to list out the companies you have worked for in the past 5 years.
As he is a Japanese, I assume he has to apply in Japan and not in Hong Kong.
Whatever the case, there are a lot in this guide! If your business is a startup, you may also need to provide business plans as well as evidence of the viability of your enterprise.