Yes would be good to have an address, BUT we do regulary update contact info, including full names and email, and often can match up this way seems to work well 99.9% of the time, I have only ever had one or two where I needed the address for verification, of which GC where able to supply very quickly when asked. Did you know for those that use software to run their business, that GC is integrated with Cleaner Planner? We have lots on GC and this one feature alone is worth the money for the time it saves me when claiming payment, two clicks no typing - job done x