WCB/WSIB certificates for subcontractors — how do you track compliance in QBO?

One thing that's easy to let slip in a busy construction business is tracking Workers' Compensation Board (WCB) or WSIB clearance certificates for your subcontractors. In most provinces you need to confirm a sub has a valid clearance letter before you pay them — or you could end up liable for their WCB premiums.

Since QBO doesn't have a built-in compliance tracker for this, how are you managing it? Are you using vendor notes in QBO, a spreadsheet, a separate app, or something else?

Extra question for anyone in multiple provinces: how do you handle the different WCB bodies (WorkSafeBC, WSIB in Ontario, WCB Alberta, CNESST in Quebec etc.)?