As of this writing (Jan 2019), the process to renew your business visa is relatively simple. Depending on which travel agency you use, they have a bit of varied requirements but to be safe, here is the full list as currently known:
Secure an employment contract from the Chief Culture Officer (aka @erika). This includes: your designation, current salary, start date, signature by Management, stamped. Printed on company letterhead.
Print a copy of your signed employment contract
Prepare a few passport-sized photos
About $300 cash
Just present all the requirements to your travel agency of choice. Keep the receipt for you to claim back your passport. Processing takes anywhere between 8 -10 days.
Once you've retrieved your passport, submit the receipt to Finance for reimbursement during the next salary schedule.
Suggested travel agency is World Pop Travel & Tour.
NOTE: Government policy re business visa renewals may change as they please.