Hong Kong’s updated yuan financing tool for banks, featuring a quota 150 per cent larger than before, was launched on Friday, giving a significant boost to the use of the Chinese currency in daily global business. What is the RMB Business Facility? The RMB Business Facility is a funding window run by the Hong Kong Monetary Authority (HKMA) that allows participating banks to borrow yuan at the relatively cheap Shanghai three-month interbank offered rate, which is about 2 percentage points lower..