Visitors are offered a line which is valid for 90 days.
You need to renew your registration each time your identification expires.
You can send an email to email@example.com and providing a proof of your business along with a valid passport.
Yes, you can register it online using your Emirates ID.
The only document accepted through these channels is the original Emirates ID.
In case the registration was not renewed, the line will be deactivated for three months and then ceased.